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# Rock samples taken from the remains of an asteroid about twice the siz

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Manager
Joined: 15 Jan 2014
Posts: 63
GMAT 1: 720 Q51 V38
Re: Rock samples taken from the remains of an asteroid about [#permalink]

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19 Mar 2015, 08:02
apolo wrote:
Yes, but contrary to what you say, OG explanation does not say that we have a tense problem in choice D; it says that we do not essentially have a verb for 'evidence'.

We must come to terms with the fact that OG explanations are not "very descriptive" (perhaps by intent).

So, when OG says very is "missing", what it perhaps means is that there is not "proper verb" ("are"); I mean if we "assume" the presence of "have been evidence", then the sentence is anyway incorrect (from a "tense" angle).

So, in the present form of the sentence, there really is "no" verb present. I don't see anything "contrary" in this.
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Re: Rock samples taken from the remains of an asteroid about [#permalink]

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19 Mar 2015, 11:05
VerbalHow wrote:
apolo wrote:
Yes, but contrary to what you say, OG explanation does not say that we have a tense problem in choice D; it says that we do not essentially have a verb for 'evidence'.

We must come to terms with the fact that OG explanations are not "very descriptive" (perhaps by intent).

So, when OG says very is "missing", what it perhaps means is that there is not "proper verb" ("are"); I mean if we "assume" the presence of "have been evidence", then the sentence is anyway incorrect (from a "tense" angle).

So, in the present form of the sentence, there really is "no" verb present. I don't see anything "contrary" in this.

Suppose that instead of 'thus is evidence of the earliest known asteroid impact on Earth', we had 'my toys for several days'.

Do you think that then, choice D would be correct, ignoring the idiom used?

1. Yes. 'Have been' can be the understood verb of the second part: 'and [have been] my toys for several days.'
2. No. 'Have been dated' is the verb of the first part and hence we have: 'and [have been dated] my toys for several days', which does not make sense.

I am wondering which view is correct?!
Intern
Joined: 17 Dec 2014
Posts: 15
Sentence correction: idiom "dated at" [#permalink]

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20 Apr 2015, 20:13
I'm studying with the 2015 Official Guide and the very last question (#140) of the sentence correction section is this:

Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

the correct answer was "have been dated at 3.47 billion years old and thus are."

I've always thought of this phrase to be "dated to be XXX years old." For anyone who's seen similar questions, does GMAT treat "dated at" as the correct idiom at all times?

(There is a similar question that uses the word "estimated," but this one states "estimated to be XYZ years old" to be the correct answer. )
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Joined: 28 Dec 2011
Posts: 4680
Re: Sentence correction: idiom "dated at" [#permalink]

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22 Apr 2015, 15:46
daysandhours wrote:
I'm studying with the 2015 Official Guide and the very last question (#140) of the sentence correction section is this:

Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

the correct answer was "have been dated at 3.47 billion years old and thus are."

I've always thought of this phrase to be "dated to be XXX years old." For anyone who's seen similar questions, does GMAT treat "dated at" as the correct idiom at all times?

(There is a similar question that uses the word "estimated," but this one states "estimated to be XYZ years old" to be the correct answer. )

Dear daysandhours,
I'm happy to respond.

The idiom "dated at" is 100% correct and favored by the GMAT, whereas "dated to be" is awkward and unidiomatic. I discuss this in this blog:
https://magoosh.com/gmat/2013/gmat-prep ... potpourri/

You may find helpful our free GMAT Idiom ebook:
https://magoosh.com/gmat/2013/gmat-idiom-ebook/
This information is also available in free Flash Card form:
https://gmat.magoosh.com/flashcards/idioms

Does all this make sense?
Mike
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Re: Sentence correction: idiom "dated at" [#permalink]

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03 May 2015, 18:01
GMAT likes "dated at" but "estimated to be"
GMAT is annoying at times.
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Re: Sentence correction: idiom "dated at" [#permalink]

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12 Nov 2015, 10:53
Paleontologists believe that fragments of a primate jawbone unearthed in Burma and estimated at 40 to 44 million years old provide evidence of a crucial step along the evolutionary path that led to human beings.
(A) at 40 to 44 million years old provide evidence of
(B) as being 40 to 44 million years old provides evidence of
(C) that it is 40 to 44 million years old provides evidence of what was
(D) to be 40 to 44 million years old provide evidence of
(E) as 40 to 44 million years old provides evidence of what was
[Reveal] Spoiler: OA
D

Director
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Sentence correction: idiom "dated at" [#permalink]

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12 Nov 2015, 21:04
SLAYGMAT wrote:

Hi! estimated to be and dated at are both separate and correct idioms.
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Magoosh GMAT Instructor
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Re: Sentence correction: idiom "dated at" [#permalink]

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13 Nov 2015, 10:32
SLAYGMAT wrote:

Dear SLAYGMAT,
I'm happy to jump in here. Yes, as EducationAisle, the idioms "dated at" and "estimate X to be" are 100% valid GMAT idioms. These and many more are included in our free GMAT Idiom Flashcards.
https://gmat.magoosh.com/flashcards/idioms
Enjoy!
Mike
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Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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09 Jul 2016, 00:46

EXPLANATION :-
1) dated at is the correct idiom

2) the subject of the sentence is "rock samples" therefore SV agreement dictates that we use "Have". "Has" is incorrect

only E uses both "dated at" and "have"

souvik101990 wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are

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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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19 Aug 2016, 12:33
souvik101990 wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

rock samples......., have. correct match of SV.
dated at - correct idiom
have been dated ...and thus are... parallel

(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are
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Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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03 Jan 2017, 02:21
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

Rock samples is the plural subject and thus needs a plural verb (have).
Choices A and B out.

Dated at is the correct idiom. Choice C and D out.

E is the answer. Clear winner.
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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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29 Jan 2017, 23:02
Hi Experts,

Dated to be vs Dated at

Thanks
Manhattan Prep Instructor
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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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29 Jan 2017, 23:40
PathFinder007, this difference seems to have been discussed a good deal in the thread. Do you have a specific question about it?

The short answer is that "dated to be" doesn't work. We estimate/believe/prove something "to be" a certain age, but that doesn't work with "date." You could say "I estimate that this rock is 3 billion years old." You couldn't say "I date that this rock is 3 billion years old." It just isn't the same kind of verb. Similarly, you can say "I estimate it to be 3 billion years old" and not "I date it to be 3 billion years old."
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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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04 Apr 2017, 03:55
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

Clause 1: Rock samples (Subject which is plural)...................has been dated and is (verbs which are singular.....ERROR)
Clause 2: 'that' (subject and refers to asteroid)......................eradicated (verb)

Rock samples have been dated and are

The correct idiom is "dated at".
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Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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03 May 2017, 01:01
TomB wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are

First Glance

The underline starts with the verb has; other answers start with have, so look for subject-verb issues.

Issues

(1) Subject-Verb; has; is

In the original sentence, the subject is the plural rock samples and the verb is the singular has been dated. Mismatch!

A plural subject needs a plural verb; eliminate answers (A) & (B), which both use the singular has. It turns out that the sentence also contains a second verb that goes with the same plural subject: is. Only answer (A) contains this error. The remaining answer use either the plural are or eliminate the verb entirely. (Remember that split for later.)

(2) Idiom: dated to be; dated as being

If you know the correct idiom, you might spot the error in the original sentence. If you don't, a vertical scan reveals that the answers offer three different options: dated to be, dated at, or dated as being.

The correct idiom for estimating the age of something is dated at a certain age. Eliminate answers (A), (C), and (D).

(3) Structure

Tackle the are versus nothing split mentioned in the subject-verb discussion above. (Remember that you already eliminated answer (A) for using is.)

(B), (D): Rock samples have been dated and thus evidence
(C), (E): Rock samples have been dated and thus are evidence

The and creates a parallel construction. Answers (B) and (D) are missing the needed verb are and are therefore sentence fragments; eliminate them

Correct answer (E) changes both verbs to the plural form to match the plural subject rock samples. Further, this choice uses the correct idiom, dated at a certain age.
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Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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03 May 2017, 04:25
souvik101990 wrote:
Before moving to OE
What is the correct idiom for:
estimated to be Vs estimated at?

Do refer the excerpt from Manhattan Sentence Correction Sixth Edition.
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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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03 May 2017, 04:51
Yes.

Dated at
Estimated to be

GMAT is weird.

Sent from my iPhone using GMAT Club Forum
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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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14 May 2017, 13:03
TomB wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are

A "Dated to be" is an incorrect idiom.
B The phrase after "thus" is a fragment.
C "Dated to be" is an incorrect idiom.
D "Dated as being" is an incorrect idiom.
E Correct.
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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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21 Jun 2017, 15:26
1
This post was
BOOKMARKED
I solved this question correctly but I have one question.
In parallelism, Don't the entities have to have similar verb tense?
For example in the correct choice,
(have been & .. is...) > present perfect & Simple present
Is there any rules that states that they both have to have the same tense? I studied it but can't be sure.

thanks
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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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21 Jun 2017, 21:18
Harshani wrote:
In parallelism, Don't the entities have to have similar verb tense?

Hi Harshani, indeed this is often a source of confusion.

Tenses and voice (active / passive voice) are not a part of parallelism. So, the various parallel entities of a sentence can have different tense/voice.

Our book EducationAisle Sentence Correction Nirvana has a handy small note on how tenses and voice are not part of parallelism. Have attached the corresponding section of the book, for your reference.
Attachments

Parallelism - Tenses.pdf [10.21 KiB]

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Re: Rock samples taken from the remains of an asteroid about twice the siz   [#permalink] 21 Jun 2017, 21:18

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