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Changes in the composition of the light of a supernova—an exploding

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Changes in the composition of the light of a supernova—an exploding [#permalink]

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New post Updated on: 06 Apr 2018, 21:08
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Changes in the composition of the light of a supernova—an exploding star—reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas.

(A) reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas

(B) reveals not only what chemical elements are in the explosion but also the speed at which the outer layers of stellar gas are expanding

(C) not only reveal the chemical elements in the explosion but also the speed of the expanding outer layers of stellar gas

(D) not only reveal what chemical elements are in the explosion but also the speed of the outer layers of stellar gas when they are expanding

(E) reveal not only the chemical elements in the explosion but also the speed at which the outer layers of stellar gas are expanding
[Reveal] Spoiler: OA

Originally posted by leeye84 on 17 Mar 2007, 15:08.
Last edited by hazelnut on 06 Apr 2018, 21:08, edited 3 times in total.
Edited the question.
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Re: Changes in the composition of the light of a supernova—an exploding [#permalink]

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New post 17 Mar 2007, 19:56
I had C on my first try. I understand the S-V agreement, but how is the parallelism in place here?
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Re: Changes in the composition of the light of a supernova—an exploding [#permalink]

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New post 17 Mar 2007, 21:28
(E)

Reveal not only A but also B is the correct form.

In other choices ||ism is broken by saying "Not only reveal A but also <needed>"
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Re: Changes in the composition of the light of a supernova—an exploding [#permalink]

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New post 03 Jul 2013, 10:11
I think the options B, C and D breaks the parallelism rule. Not only X but also Y, X and Y should be parallel. A and E both have parallel X and Y but they A is incorrect due to its faulty S-V agreement (Changes .... reveals), Hence I picked E
Pls correct me if I am wrong
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Re: Changes in the composition of the light of a supernova—an exploding [#permalink]

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New post 24 Feb 2018, 20:18
I was confused with subject here, not sure whether it was "Changes" or "an exploding star".

Subject will not be in prep phrase.

In this example on what grounds we decide that "an exploding star" is not a subject.

Thanks in advance for the help.

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Re: Changes in the composition of the light of a supernova—an exploding [#permalink]

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New post 30 Mar 2018, 13:14
jrk23 wrote:
I was confused with subject here, not sure whether it was "Changes" or "an exploding star".

Subject will not be in prep phrase.

In this example on what grounds we decide that "an exploding star" is not a subject.

Thanks in advance for the help.

Rgds,
Ram


Hi jrk23,

Here are 3 ways to decide:

1) Punctuation

A pair of dashes is similar to parentheses, or 2 commas. " - an exploding star -" just serves to define what a supernova is.

You are correct that "Subject will not be in prep phrase".

"in the composition of the light of a supernova - an exploding star -" is a common tactic by the test writers to distract you from the subject, "Changes"

For subject-verb issues, ignore modifiers such as this and simplify it to "Changes reveal".


2) Structure

If "reveals" is the verb for "an exploding star", then "Changes" would be hanging without a verb. A common error is to have no main verb for a subject.


3) Meaning

"Changes reveal" fits better with the intended meaning.

Is it the star ITSELF that reveals the chemical elements in the explosion and speed of expanding the outer layers?

Or is it the changes in the composition of light?
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Re: Changes in the composition of the light of a supernova—an exploding   [#permalink] 30 Mar 2018, 13:14
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Changes in the composition of the light of a supernova—an exploding

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