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# Neuroscientists, having amassed a wealth of knowledge over the past

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Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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Updated on: 21 Oct 2018, 23:50
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Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

(A) Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the human brain and its development from birth to adulthood, are

(B) Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are

(C) Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are

(D) Neuroscientists have amassed a wealth of knowledge over past twenty years about the brain and its development from birth to adulthood,

(E) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,

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Originally posted by RenukaD on 26 Jun 2010, 09:04.
Last edited by Bunuel on 21 Oct 2018, 23:50, edited 6 times in total.
Renamed the topic and edited the question.
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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Updated on: 15 May 2014, 05:09
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Hi All,

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how the babies acquire language.

Error Analysis:

1) Plural subject “neuroscientists” has the plural verb “are”.
2) Modifier “having amassed…” correctly modifies the preceding noun neuroscientists. There is no construction error in the modifying phrase also. Thus, there is no error in this sentence.

POE:

Choice A: Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are : Correct. This choice is correct as is as pointed out in sentence analysis.

Choice B: Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are : Incorrect. 1) The phrase “over the past twenty years” seems to talk about the development of the brain from birth to adulthood that took twenty years to develop. However, it is the neuroscientists who took twenty years to study about the development of the brain. Thus, this choice distorts the meaning of the sentence.
2) The clause preceding conjunction “and” does not have a main verb. Thus this choice is a fragment.

Choice C: Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are: Incorrect. 1) The phrase “over the past twenty years” seems to talk about the development of the brain from birth to adulthood that took twenty years to develop. However, it is the neuroscientists who took twenty years to study about the development of the brain. Thus, this choice distorts the meaning of the sentence.
2) The clause preceding conjunction “and” does not have a main verb. Thus this choice is a fragment.

Choice D: Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood: Incorrect. In this choice, "now drawing" acts as a comma + verb-ing modifier. The focus on the main information here has shifted from " are now developing" in the original sentence to "have amassed". In the original sentence, the action that is primary is "now developing" and "amassing knowledge" comes as an additional information. This choic reverses that order by making the main action additional information and the additional information into the main action. This is a clear shift in the intended meaning.

Choice E: Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood: Incorrect. Same meaning error as in Choice D.

Hope this helps.
Thanks.
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Originally posted by egmat on 09 May 2012, 04:50.
Last edited by egmat on 15 May 2014, 05:09, edited 1 time in total.
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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06 May 2012, 09:48
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sravanth wrote:
Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

(A) Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are
(B) Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are
(C) Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are
(D) Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,
(E) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,

Use the flip it technique:
Having amassed.... modifies neuroscientists hence flipping it to change the construction: 'Ing(opening modifier), subject + verb,

Having [opening modifier]amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, Neuroscientists [subject] are [verb] now drawing solid conclusions about how the human brain grows and how babies acquire language. Hence option A is correct.

Try the flip it with other options and you will find that other options use incorrect construction and are hence awkward.
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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Updated on: 26 Jun 2010, 11:27
10
Neuroscientists,having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about the human brain grows and how babies acquire language.

A)Neuroscientists,having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are

B)Neuroscientists,having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years,and are

C)Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years,and are

D)Neuroscientists have amassed a wealth of knowledge over past twenty years about the brain and its development from birth to adulthood,

E) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood ,

It will be helpful if experts can advise the solution and reason for the solution

Im no expert but this is what I think

B. The new placement of the prepositional phrase "over the past twenty years" changes the meaning of the sentence. Instead of modifying the verb amassed it now seems to modify adulthood.

C. The way this sentence is constructed suggest a compound predicate, but the first part of the sentence has no working verb. Amassing by itself does not function as the verb of the sentence - its a modifier. If you have mahattans sc they tell you that words connected by AND should be parallel.

D. Like B. D also has a shift in meaning. By getting rid of the word ARE the phrase "now drawing solid conclusions about the human brain grows and how babies acquire language." acts more like a modifier. Put this phrase in front and you'll see the change in meaning.

E. E has the same problem as D.

The correct answer A is grammatical - there isnt anything wrong with it.

Originally posted by Detran on 26 Jun 2010, 11:07.
Last edited by Detran on 26 Jun 2010, 11:27, edited 1 time in total.
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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06 Sep 2013, 06:01
4

Hi Mugdha,

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

Once again, I would say that you have done a good job in analyzing this one. However, the clause split for this one is not accurate. Let's look at the clauses in this sentence:

Cl. 1: Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about
Cl. 2: how the human brain grows and
Cl. 3: how babies acquire language.

Since we cannot have a clause without an SV pair, the additional information cannot be identified as a clause because it does not have a Subject and a Verb.

I would never advise to skip the additional information completely while doing the PoE. The best way to answer questions where answer choices confuse us is to stay focused on the meaning of the sentence. You have understood the intended meaning of this sentence alright. Now let's compare that meaning with the meaning that we get from choices D and E.

Choice D: Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, - Per this choice, now the focus (main point) of the sentence is that Neuroscientists have amassed a lot of knowledge... However, per the original sentence, the focus of the sentence is that Neuroscientists are now drawing conclusions... This choice shifts the focus of the sentence completely. The main point of the sentence in Choice A is now an additional information in this choice. On this basis, we can eliminate this answer choice.

Choice E: Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood, - Incorrect for the same reason as explained above.

So keep the intended logical meaning of the sentence as the main guide while doing the PoE.

Hope this helps.
Thanks.
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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15 May 2014, 02:45
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honchos wrote:
I am also your Verbal Live student.

in the above mentioned question OA is A. I did it right.

but I reasoned it on this line to eliminate D and E.

let suppose D is right for a Moment in that case Neuroscientists will have two subjects have and are so D and E cannot be correct. Is my line of thought correct?

Hi @honchos,

I'm assuming you meant that the subject 'neuroscientists' would have two verbs. However, 'are' is not present in options D and E, so the verb 'are drawing' becomes the modifier 'drawing' in these options.

Before we get to the problem in options D and E, let’s look at the intended meaning of choice A. Remember we need to first thoroughly understand the original sentence so that we can properly gauge the other answer choices.

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

This sentence indicates the following:
• Over the past 20 years, neuroscientists have collected a lot of knowledge about 2 things - brain and its development
• Neuroscientists are now drawing conclusions about 2 things - growth of human brain and acquiring language.
Key things to notice:

Two actions are being discussed:
a. In the past, scientists collected information
b. Now in the present context, scientists are drawing conclusions

Now let’s take a look at choice D:

Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, now drawing solid conclusions about how the human brain grows and how babies acquire language.

Let’s focus on the sequencing of tenses in this sentence. For this, I will omit “now” for now. We will bring this back after this bit of discussion.

Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, drawing solid conclusions about how the human brain grows and how babies acquire language.

Let’s read this sentence now and see what meaning it communicates.
• Over the past 20 years, neuroscientists have collected a lot of knowledge about 2 things.
• The verb-ing modifier can either present result of preceding clause or elaborate on the preceding clause. Let’s see which meaning is logical here:

o Elaborating - They collected a lot of knowledge in the past by drawing solid conclusions about 2 things.
 This seems illogical since one does not collect information by drawing conclusions.

o Result - They collected a lot of knowledge in the past and this led to them drawing solid conclusions.
 This seems rather logical. After they collected knowledge, they were able to draw solid conclusions.

But notice one very important thing. In this sentence, both the actions appear to have taken place in the past. The information was collected in the past and the conclusions were also drawn in the past.

Now bring back your understanding of choice A. Per choice A, collection took place in the past but the conclusions were being drawn in the present.

So this is the first reason for rejecting choice D - the shift in the meaning of the sentence.

Now let’s bring back the word “now”. This word interferes with the logical sequence of actions established in choice D. The logical sequence as we determined was that both actions took place in the past, but the presence of “now” forces the second action to take place in present, thereby creating a conflict.

And lastly, there is a focus shift in choice D.

Note that modifiers typically do not present the main point of the sentence: they only give additional information. In the original sentence, the subject of the main clause is “Neuroscientists” and the verb is “are drawing”. So, the intended focus is to say that neuroscientists are now drawing solid conclusions about something. This focus is now shifted to the collection of information.

So, in conclusion:

It’s very important to understand the meaning of the original sentence so that you can assess answer choices in the appropriate light. Remember, grammar is a tool to help you communicate ideas. But there is no use of learning about grammar rules if you do not pay attention to what it is that you have to communicate using these tools.

I hope this helps!

Regards,
Meghna
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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22 Jul 2018, 23:04
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Hero8888 wrote:
Hi EducationAisle!

OA: Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

Question: Usualy in GMAT SC "having ..." takes past perfect. But I also know that -ing modifier takes the tense of the main verb. Can we infer that in this case"having" is in present perfect, not in past perfect?
Otherwise how to justify usage of past perfect instead of simple construction such as: Neuroscientists, amassed a wealth..., are now drawing.

Hi Hero8888, you are correct! Having + Past Participle basically depicts an action that completed before the main verb in the sentence. Hence,

i) If the main verb is in past, Having + Past Participle acts like past perfect
ii) If the main verb is in present (as is the case in option A here), Having + Past Participle acts like present perfect

Quote:
About option D: Neuroscientists have amassed a wealth of knowledge over past twenty years about the brain and its development from birth to adulthood, now drawing solid conclusions about how the human brain grows and how babies acquire language.

Question: Is the only problem of this option that it shifts focus from main action "are now drawing solid conclusions" to "have amassed a wealth of knowledge'? Otherwise the sentence sounds pretty (grammatically and logically) correct.

These type of Present participles (are now drawing solid conclusions..) should depict simultaneous result of the previous clause (For example: Peter met with an accident, sustaining severe injuries). Option D does not represent this scenario and is hence, incorrect.
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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08 Dec 2012, 11:09
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Hi htskumar,

I'll leave the boys at egmat to explain their answer further for you, but see if I can help with your second question

OG12 says, The final descriptor in present tense, now drawing conclusions...does not fit the opening clause, which is in present perfect tense (have amassed a wealth...) ----> What does this exactly mean?

This means that 'have amassed a wealth' is an event that happened in the past in an action that is completed(past perfect tense if you will), but the 'now drawing conclusions' is happening now (present tense). In interpreting the meaning of the sentence, this does not make sense.

The correct answer (A) moves from 'having amassed' to 'now drawing' this is more correct, 'having done some thing I now do something else'

Does that help?

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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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22 Jun 2013, 06:32
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Neuroscientists,having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about the human brain grows and how babies acquire language.

A)Neuroscientists,having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are

B)Neuroscientists,having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years,and are
No verb for Neuroscientists
C)Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years,and are. No verb for Neuroscientists

D)Neuroscientists have amassed a wealth of knowledge over past twenty years about the brain and its development from birth to adulthood, "drawing " is modifying what "adulthood"

E) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood , "drawing " is modifying what "adulthood"

Note correct SV pair: Neuroscientists are
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01 Oct 2014, 01:36
1
TGC wrote:
Although it is already explained, I am not clear with it. And I also posted the same query before.

OE for Option (D).

The final descriptor in present tense, now
drawing conclusions ... does not fit the
opening clause, which is in present-perfect
tense {have amassed a wealth ...) and seems

Scientists have amassed a wealth of knowledge, now drawing solid conclusions.......

What is the problem with having Present perfect as main clause and a descriptor in present tense?

Second,

As in GMAT lingo, we know that -ING modifier is used for two things (1). Additional info about preceding clause (2). Result of preceding clause.

Then why OE /OG rejects option (D) saying that final descriptor seems to modify ADULTHOOD

PPS: I have read the above explanation by MEGHNA, but still there is doubt.

Hi Saurabh,
Thank you for posting your query here.

There are two problems with option D, as Meghna explained above:

1. Shift in Focus: In the original sentence the information that neuroscientists have amassed a wealth of knowledge is given in the form of a modifier. Also, it seems that the main point that the sentence wants to convey is what scientists are doing now after they have already amassed a wealth of knowledge. Now, option D shifts the focus of the sentence to the modifier part. So, this is an error.

2. Also, per the original sentence the neuroscientists have completed the action of amassing the wealth over a duration of 20 years. The verb-ing modifier "drawing" presents the result of this clause that the action of amassing the wealth of knowledge has resulted in drawing some conclusions. As we know, the verb-ing modifier takes the tense of the preceding clause in such cases. So, per this choice the conclusions are being drawn for the last 20 years. However, the presence of the word "now" interferes with the logical sequence of the actions because it indicates that the action of drawing conclusions is taking place in the present. So, there is a conflict in the meaning.

Now, the explanation provided by the OG in this case states something else. Here, the verb-ing modifier "drawing" modifies the preceding clause, not the preceding noun "adulthood".

Hope this helps!
Regards,
Deepak
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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20 Jul 2017, 09:43
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Top Contributor
Quote:
Neuroscientists, having amassed a wealth of knowledge over the past twenty years

There is some doubt about this structure that since having amassed is an adverbial modifier, it should modify the previous clause and since there is no clause before the said modifier, but only a noun, this structure is inherently wrong.
IMO, this is not a correct perception.
Now let's look at this structure.
Quote:
Having amassed a wealth of knowledge over the past twenty years about, Neuroscientists

Can we now argue that this structure is wrong because there is no clause before the modifier?
The point is the verb + ing modifier, which we assumed, as an adverbial modifier becomes an adjective modifier when placed in the beginning of the clause.
The issue in question---
1. Neuroscientists, having amassed a wealth of knowledge over the past twenty years --- is actually --
--Having amassed a wealth of knowledge over the past twenty years, Neuroscientists --
Therefore, per se, that part is legal.
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Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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Updated on: 20 Mar 2019, 08:29
1
1
Hello Everyone!

Let's tackle this question, one issue at a time, to find the correct answer quickly! First, here is the original question, with the major differences between the options highlighted in orange:

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

(A) Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the human brain and its development from birth to adulthood, are
(B) Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are
(C) Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are
(D) Neuroscientists have amassed a wealth of knowledge over past twenty years about the brain and its development from birth to adulthood,
(E) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,

After a quick glance over the options, there are clearly a few things we can focus on:

1. Where to place the phrase "over the past twenty years"
2. How each option begins (modifiers, non-essential phrases, verbs)

Let's start with #1 on our list: where to place the phrase "over the past twenty years." This phrase is meant to modify, or add more detail, to some part of this sentence, but which part? WHAT was done over the past 20 years? Let's take a closer look at each option, and figure out the best location for that phrase:

(A) Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the human brain and its development from birth to adulthood, are --> OKAY
It's clear that what happened over the past 20 years was researchers amassing a wealth of knowledge, so let's keep this one for later.

(B) Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are --> WRONG
This is misleading because it suggests that the phrase "over the past 20 years" is modifying "development from birth to adulthood." The research isn't over the past 20 years of someone's life - the research was collected over the past 20 years.

(C) Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are --> WRONG
Again, this is misleading because it suggests that the research covers the brain development over 20 years of a person's life, which isn't the intended meaning. It's supposed to say that the research was collected over the span of 20 years.

(D) Neuroscientists have amassed a wealth of knowledge over past twenty years about the brain and its development from birth to adulthood, --> OKAY
It's clear that the research was collected over a span of 20 years, so let's keep this one for later.

(E) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood, --> WRONG
While this isn't grammatically incorrect, it does change the meaning of the original sentence slightly. By putting the phrase "over the past twenty years" in between commas, it's now a non-essential clause. By making this an "optional" phrase, we are saying that the length of time it took to amass this information isn't important. We would argue that it is important because it adds more detail to the idea that it took 20 years to gather all the information, and that neuroscientists are ONLY NOW figuring out what to do with all the information.

We can eliminate options B, C, and E because they place the phrase "over the past twenty years" in the wrong place.

Now that we're only left with 2 options, let's take a closer look at each one to determine which is the best choice. To make this easier, I've included the remaining part of the sentence at the end:

(A) Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the human brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

This is CORRECT! The phrase "over the past twenty years" is in the best location to create clarity and provide accurate information. The non-essential modifier, "...having amassed...to adulthood" uses the right punctuation and doesn't create any problems with verb tenses.

(D) Neuroscientists have amassed a wealth of knowledge over past twenty years about the brain and its development from birth to adulthood, now drawing solid conclusions about how the human brain grows and how babies acquire language.

This is INCORRECT for a couple reasons. First, it uses the present perfect "have amassed," which means that neuroscientists started looking for knowledge in the past and are still looking for it today. This isn't true. They collected all the information in the past, and they are done looking for it - they've moved on to drawing conclusions about brain development based on what they already found! Second, the modifier "now drawing solid conclusions..." sounds like it's in the wrong place, or needs to be worded more clearly to show that it's talking about the neuroscientists drawing conclusions. It's not technically wrong, but it could be confusing to readers.

There you have it - option A was the best choice after all!

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Originally posted by EMPOWERgmatVerbal on 23 Oct 2018, 11:08.
Last edited by EMPOWERgmatVerbal on 20 Mar 2019, 08:29, edited 1 time in total.
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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01 Aug 2019, 22:06
1
ccheryn wrote:
at experts,

As we know, the verb-ing modifier takes the tense of the preceding clause in such cases.

is above the rule... can i have few more gmac questions in this.. ( especially taking the past tense, as verb ing is a present participle, how it can take past tense or any other tense)

is the above a rule. can
I'm not sure what Deepak meant by:

As we know, the verb-ing modifier takes the tense of the preceding clause in such cases.
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18 Oct 2013, 20:31
1
Hi Meghna,

Neuroscientists,having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about the human brain grows and how babies acquire language.

A)Neuroscientists,having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are

B)Neuroscientists,having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years,and are

C)Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years,and are

D)Neuroscientists have amassed a wealth of knowledge over past twenty years about the brain and its development from birth to adulthood,

E) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood ,

This sentence has three clause.
clause 1 : Neuroscientists,(subject)
having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,(verb-ing modifier that modifies Neuroscientists)
are (verb) now drawing solid conclusions about
Clause 2 : how the human brain grows and
Clause 3 : how babies acquire language.(clause 2 and 3 are parallel)

there is nothing wrong with the above sentence. but we should reject all the other choices for good reasons.
Choice B) this choice is wrong because a comma +and is used before "are", implying that there is another verb before "are" in the sentence. however, there is no other verb in the sentence.
choice C) it has the same problem as choice B. In addition the placing of the modifier "over the past twenty years" changes the meaning. Now the reader conclude that the development of the brain was over past twenty years
choice D) I do not find any thing wrong with this choice. this choice says that Neuroscientists
have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, now drawing solid conclusions about how the human brain grows and how babies acquire language.
In this sentence the verb -ing form modifies entire preceding clause and expresses the result of Neuroscientists action which is having amassed a wealth of knowledge.
Choice E) Same analysis as for choice D.

what is wrong with my analysis for choices D and E?
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21 Oct 2013, 12:13
Hi there,

Thanks for posting your query here, as suggested.

I'm happy you brought up this question, because it’s a very pertinent doubt and it shows that your thinking is thorough.

The problem with options D and E is in the use of present perfect tense. Note that the original sentence is in the present tense: Neuroscientists... are now drawing solid conclusions. In the original sentence, there is no verb in the present perfect tense. However, options D and E change ‘amassed’ into ‘have amassed’. ‘Have amassed’ is only referring to the period of twenty years, not to what is happening ‘now’. The present tense verb ‘are’ is necessary to make the meaning clear, but it’s missing from these two options. We’re talking about two separate actions here: what scientists have done over the past twenty years (amassed knowledge), and what they are doing now (drawing conclusions).

I hope this helps!

Regards,
Meghna
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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26 Nov 2013, 04:20
egmat wrote:

Hi Mugdha,

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

Once again, I would say that you have done a good job in analyzing this one. However, the clause split for this one is not accurate. Let's look at the clauses in this sentence:

Cl. 1: Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about
Cl. 2: how the human brain grows and
Cl. 3: how babies acquire language.

Since we cannot have a clause without an SV pair, the additional information cannot be identified as a clause because it does not have a Subject and a Verb.

I would never advise to skip the additional information completely while doing the PoE. The best way to answer questions where answer choices confuse us is to stay focused on the meaning of the sentence. You have understood the intended meaning of this sentence alright. Now let's compare that meaning with the meaning that we get from choices D and E.

Choice D: Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, - Per this choice, now the focus (main point) of the sentence is that Neuroscientists have amassed a lot of knowledge... However, per the original sentence, the focus of the sentence is that Neuroscientists are now drawing conclusions... This choice shifts the focus of the sentence completely. The main point of the sentence in Choice A is now an additional information in this choice. On this basis, we can eliminate this answer choice.

Choice E: Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood, - Incorrect for the same reason as explained above.

So keep the intended logical meaning of the sentence as the main guide while doing the PoE.

Hope this helps.
Thanks.

Hi e-GMAT experts,

In the question here, option A

The ing-modifier is supposed to modify subject-verb pair. So where is the verb here ?
Is "having" a noun modfier and not a ing modifier , Please clarify ?

Regards,
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27 Nov 2013, 00:03
ygdrasil24 wrote:

Hi e-GMAT experts,

In the question here, option A

The ing-modifier is supposed to modify subject-verb pair. So where is the verb here ?
Is "having" a noun modfier and not a ing modifier , Please clarify ?

Regards,

Hi ygdrasil24,

Note that, when placed adjacent to the subject of the clause, a "comma + verb-ing modifier" can modify either the subject or the entire clause. The modification is based on the context.

In this sentence the verb-ing modifier "having amassed..." is modifying the subject "Neuroscientists".

On a different note, the verb for the subject "neuroscientists" is "are drawing".

Hope this helps

Regards,
Krishna
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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07 Apr 2014, 07:31
egmat wrote:
Hi All,

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how the babies acquire language.

Error Analysis:

1) Plural subject “neuroscientists” has the plural verb “are”.
2) Modifier “having amassed…” correctly modifies the preceding noun neuroscientists. There is no construction error in the modifying phrase also. Thus, there is no error in this sentence.

POE:

Choice A: Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are : Correct. This choice is correct as is as pointed out in sentence analysis.

Choice B: Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are : Incorrect. 1) The phrase “over the past twenty years” seems to talk about the development of the brain from birth to adulthood that took twenty years to develop. However, it is the neuroscientists who took twenty years to study about the development of the brain. Thus, this choice distorts the meaning of the sentence.
2) The clause preceding conjunction “and” does not have a main verb. Thus this choice is a fragment.

Choice C: Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are: Incorrect. 1) The phrase “over the past twenty years” seems to talk about the development of the brain from birth to adulthood that took twenty years to develop. However, it is the neuroscientists who took twenty years to study about the development of the brain. Thus, this choice distorts the meaning of the sentence.
2) The clause preceding conjunction “and” does not have a main verb. Thus this choice is a fragment.

Choice D: Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood: Incorrect. 1) In this choice, the second clause preceded by comma does not have a main verb making it a fragment.
2) Generally, a clause is introduced after the comma. But here, there is neither any subject nor any verb for the clause. Moreover, the clause is a fragment.
3) Also, the modifier “now drawing” seems to modify “adulthood” which makes no sense.

Choice E: Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood: Incorrect. 1) In this choice, just like choice D, the second clause preceded by comma does not have a main verb making it a fragment.
2) Generally, a clause is introduced after the comma. But here, there is neither any subject nor any verb for the clause. Moreover, the clause is a fragment.
3) Also, the modifier “now drawing” seems to modify “adulthood” which makes no sense.

Hope this helps.
Thanks.

I am also your Verbal Live student.

in the above mentioned question OA is A. I did it right.

but I reasoned it on this line to eliminate D and E.

let suppose D is right for a Moment in that case Neuroscientists will have two subjects have and are so D and E cannot be correct. Is my line of thought correct?
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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09 Jun 2014, 22:52
Although it is already explained, I am not clear with it. And I also posted the same query before.

OE for Option (D).

The final descriptor in present tense, now
drawing conclusions ... does not fit the
opening clause, which is in present-perfect
tense {have amassed a wealth ...) and seems

Scientists have amassed a wealth of knowledge, now drawing solid conclusions.......

What is the problem with having Present perfect as main clause and a descriptor in present tense?

Second,

As in GMAT lingo, we know that -ING modifier is used for two things (1). Additional info about preceding clause (2). Result of preceding clause.

Then why OE /OG rejects option (D) saying that final descriptor seems to modify ADULTHOOD

PPS: I have read the above explanation by MEGHNA, but still there is doubt.
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Re: Neuroscientists, having amassed a wealth of knowledge over the past  [#permalink]

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25 Apr 2016, 03:16
egmat,

A question, in the course you say that , -ing mod modifies the preceding CLAUSE. However "Neuroscientists" is not a clause, its a Subject\noun, so is the ,-ing construction correct?.. I eliminated A because of it. I thought that construction without comma would be the correct one since if there is no comma, then -ing modifies the preceding noun.

Thank you!
Re: Neuroscientists, having amassed a wealth of knowledge over the past   [#permalink] 25 Apr 2016, 03:16

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