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# Some bat caves, like honeybee hives, have residents that

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Manager
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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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20 Feb 2013, 14:00
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25% (medium)

Question Stats:

69% (00:35) correct 31% (00:55) wrong based on 171 sessions

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Hi guys, can somebody explain the parallel construction A, B and C, and D ? Isn't it a little bit awkward and wrong ? In which case can we have a list with two "and" ?

Thx !
[Reveal] Spoiler: OA

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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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19 Dec 2013, 04:29
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This is a test of list parallelism, made tricky by mixing up with pseudo parallels

Th basic theory of list parallelism stipulates that it is important to identify the elements of the series first. Within each series, the last factor is always preceded by the word “and” which marks the end of the series.
If there are more than one series, then the last series by itself has to be again preceded by another “and”.
If there are more than one series in a passage, ensure that each of the series maintains its own parallel structure within its domain.

In the given text, we have two series.
1. One is the ‘defending’ series that includes acting as sentinels and sounding a warning
2. The other is the ‘scouting’ series that includes searching for new food and roosting

These two arms must be separated by an ‘and’; all choices do that and so no issue about it.
But it is the parallelism within each series that is presenting a problem here. As you may see,
Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels and to sound a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.

(A) Acting as sentinels and to sound --- acting and to sound is not parallel in the first series.
(B) acting as sentinels and sounding – perfect parallelism -- correct choice
(C) to act as sentinels and sound --- The infinitive spoils the parallelism since, the first duty is marked as defending and the other duties must also be in the same ing form rather than in infinitive form
(D) to act as sentinels and to sound --- same as C
(E) To act as a sentinel sounding --- same as C and D
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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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20 Feb 2013, 14:55
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Expert's post
Darmody wrote:
Hi guys, can somebody explain the parallel construction A, B and C, and D ? Isn't it a little bit awkward and wrong ? In which case can we have a list with two "and" ?

Thx !

Hi Darmody,

Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels and to sound a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.

(A) acting as sentinels and to sound

Changes the meaning by changing the list

(B) acting as sentinels and sounding

Correct, maintains parallel structure in all the lists

(C) to act as sentinels and sound

Changes the meaning; sentence now implies that they defend to act as sentinels and sound...

(D) to act as sentinels and to sound

Same as C

(E) to act as a sentinel sounding

Again changes the meaning; moreover "sentinel" should be plural as "residents" is plural.

The correct answer choice (B) presents the list with parallel structures. I have marked the lists by brackets in the correct version of the sentence.

Some bat caves, like honeybee hives, have residents that take on different duties such as (defending the entrance, acting as (sentinels and sounding a warning at the approach of danger), and scouting outside the cave (for new food and roosting sites)).

The best way to find out the lists is by the meaning differences between them.

for example

In sports I like ((football, baseball and table tennis), and in music I like (Rock, Jazz and Classical)).

In GMAT whenever you see "and" you should check for the logical lists and make sure the structures being listed are parallel grammatically.

Hope it helps,

Vercules
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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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21 Feb 2013, 01:24
1
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Expert's post
Darmody wrote:
Hi thx for that, one last question, in "acting as (sentinels and sounding a warning at the approach of danger) ", if I understand what you say, "sentinels" and "sounding a warning at the approach of danger" should be parallel shouldn't they ? But it does not seem to make any sense, as the sentence "acting as sounding a warning at the approach of danger" has no meaning. Did I understand it wrong?

Hi Darmody,

I can understand your concern. The correct answer choice is not a well constructed sentence and looks a little weird. But, it is the least bad among all the answer choices. The other choices are clearly wrong because almost all of them are changing the intended meaning of the sentence.

If you break the sentence; defending the entrance, acting as sentinels and defending the entrance, sounding a warning at approach of danger.

ie. by acting and sounding they are defending the entrance.

Consider an example similar in structure:

John is defending his position, acting as a lawyer and presenting a sound argument that he is not guilty.

John is defending his position in two ways

i) by acting as a lawyer
ii) by presenting a sound argument

One more similar example

By doing his job properly,acting as a role model and creating a conducive environment for the whole team, John has become the most admired manager in the company.

Tip: Concentrate more on errors in sentence correction; it is far more easier to prove that a choice is incorrect than to prove that it is correct. In your practice try to get familiar with the error patterns that sentence correction questions test.

Moreover, SC 1000 is not a very reliable source for practice. First it is quite old and contains short questions like this one, while in these days longer sentences are seen in SC in GMAT, second most of the questions are good but the bad ones could really screw up your concepts. Do it if you have exhausted all the official stuff at your disposal.

Hope it helps,

Vercules
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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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18 Dec 2013, 21:41
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egmat wrote:
We recently created a video solution for this question. For more video solutions, log in to your e-GMAT account and go to OG Verbal Solutions course.

Hi, My doubt here is that what is the parallel list here? Option 1 or Option 2?
Option 1:
1)defending
2)acting and sounding
3)scouting

Option 2:
1)defending
2)acting
3)sounding
4)scouting

Why do we need 'and' between acting & sounding when these are parallel to other 2 items in the list?

Or in other words what's wrong with this sentence -

Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels, sounding a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.
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perfect plan executed next week.’

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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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20 Feb 2013, 17:21
Hi thx for that, one last question, in "acting as (sentinels and sounding a warning at the approach of danger) ", if I understand what you say, "sentinels" and "sounding a warning at the approach of danger" should be parallel shouldn't they ? But it does not seem to make any sense, as the sentence "acting as sounding a warning at the approach of danger" has no meaning. Did I understand it wrong?

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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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01 Sep 2013, 06:09

It is a simple case of Parallelism and it is only followed in Option B which makes "defending, acting, sounding, scouting and roosting" parallel.

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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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26 Jul 2017, 01:40
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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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26 Jul 2017, 01:46
Hi Vercules,
Actually this question is from OG Verbal 2015? and it has confusin explanation:
Quote:
b. Correct. This sentence has sounding, which properly parallels
defending, acting, and scouting

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Re: Some bat caves, like honeybee hives, have residents that [#permalink]

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26 Jul 2017, 02:53
Top Contributor
Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels and to sound a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.

(A) acting as sentinels and to sound
(B) acting as sentinels and sounding
(C) to act as sentinels and sound
(D) to act as sentinels and to sound
(E) to act as a sentinel sounding

The residents take on two primary jobs namely
1. Defending the entrance: How do they defend the entrance? (by) acting as sentinels and (by) sounding a warning
The first defense job, therefore, should be represented by two parallel present participles - acting and sounding
and
2. and scouting outside the cave: What do they scout for? for new food and (for) roosting places.
That structure is available only in B.
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Re: Some bat caves, like honeybee hives, have residents that   [#permalink] 26 Jul 2017, 02:53
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