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

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Senior SC Moderator
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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, 02:01
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, 05:25
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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"Be challenged at EVERY MOMENT."

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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, 05:51
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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21 Jun 2017, 16:26
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, 22:18
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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Now! Preview the entire Grammar Section of Sentence Correction Nirvana at pothi.com

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

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24 Jun 2017, 22:40
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.

Plural Subject "Rock Samples" needs a plural verb "have" so option A and B are out

(A) has been dated to be 3.47 billion years old and thus is
Incorrect for the reason mentioned above

(B) has been dated at 3.47 billion years old and thus
Same as A

(C) have been dated to be 3.47 billion years old and thus are
Here is the verbs "have" and "are" are correctly used for plural subject samples but the idiom "dated to be" is incorrect...it must be "dated at"

(D) have been dated as being 3.47 billion years old and thus
Again the idiom "dated as being" is incorrect. Correct idiom is "dated at"
Also, after "thus" the verb "are" is required otherwise the sentence becomes a run-on sentence

(E) have been dated at 3.47 billion years old and thus are
Idiom and the verbs are correctly used.
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Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

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27 Jun 2017, 02:49
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 - "has been " does not work with plural "rock samples"
(B) has been dated at 3.47 billion years old and thus - "has been " does not work with plural "rock samples"
(C) have been dated to be 3.47 billion years old and thus are - "dated to be" incorrect idiom, although rest of the sentence is just fine
(D) have been dated as being 3.47 billion years old and thus - "are" missing after "thus"
(E) have been dated at 3.47 billion years old and thus are - CORRECT.. problems noted in above options are removed
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NOTE: I am not an expert, therefore my analysis answering the questions may be incorrect and may not be relied upon. However I will appreciate if you can correct the mistakes I may have made in my analysis.

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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 2017, 00:11
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 - Correct. Rock samples ... have been dated at...

Take away: Dated at is the correct idiom.
Re: Rock samples taken from the remains of an asteroid about twice the siz &nbs [#permalink] 19 Aug 2017, 00:11

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