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This topic has 1 expert reply and 12 member replies
DERBY29 Newbie | Next Rank: 10 Posts Default Avatar
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Post Sun Jul 19, 2009 7:22 pm
The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.

A. that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding
B. that the universe had begun in an explosive instant 10 to 20 billion years ago and had been expanding
C. that the beginning of the universe was an explosive instant 10 to 20 billion years ago that has expanded
D. the beginning of the universe to have been an explosive instant 10 to 20 billion years ago that is expanding
E. the universe to have begun in an explosive instant 10 to 20 billion years ago and has been expanding


Can anyone help in answering this question? I do apologize the underline is from the word THAT to EXPANDING.

Many thanks.

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Post Fri Jul 09, 2010 8:21 pm
DERBY29 wrote:
The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.

Many thanks.
The word "perfect" is a fancy grammatical term for "past".

has + verb (for a singular subject) and have + verb (for a plural subject) = present perfect = present past

The present perfect tense is used to describe the present in terms of a past action.


For example, one use of the present perfect tense is to describe an action that started in the past and might continue in the present:

Since the beginning of the year, John has memorized 100 GMAT idioms.

The word since indicates that John started to memorize GMAT idioms sometime after the beginning of the year (in the past) and that he might still be memorizing GMAT idioms now, in the present.

In answer choice A, the word since requires that the verb has been expanding be in the present perfect tense because the universe started to expand after the explosive instant of the big bang (in the past), and it might still be expanding now, in the present.

The verb began is in the past tense because the universe began 10 to 20 billion years ago, in the past.

When you're trying to sort out a tense issue, always look for time indicators such as since and 10 to 20 billions years ago. Such indicators can help you to determine the correct tense.

Hope this helps!

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diebeatsthegmat Legendary Member Default Avatar
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Post Fri Jul 09, 2010 3:41 pm
DERBY29 wrote:
The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.

A. that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding
B. that the universe had begun in an explosive instant 10 to 20 billion years ago and had been expanding
C. that the beginning of the universe was an explosive instant 10 to 20 billion years ago that has expanded
D. the beginning of the universe to have been an explosive instant 10 to 20 billion years ago that is expanding
E. the universe to have begun in an explosive instant 10 to 20 billion years ago and has been expanding


Can anyone help in answering this question? I do apologize the underline is from the word THAT to EXPANDING.

Many thanks.
clearly the answer must be A
because the first sentence uses " ago" and the second part uses "since" thus its tenses must be past simple and present progressive perfect tense

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Post Fri Jul 09, 2010 8:21 pm
DERBY29 wrote:
The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.

Many thanks.
The word "perfect" is a fancy grammatical term for "past".

has + verb (for a singular subject) and have + verb (for a plural subject) = present perfect = present past

The present perfect tense is used to describe the present in terms of a past action.


For example, one use of the present perfect tense is to describe an action that started in the past and might continue in the present:

Since the beginning of the year, John has memorized 100 GMAT idioms.

The word since indicates that John started to memorize GMAT idioms sometime after the beginning of the year (in the past) and that he might still be memorizing GMAT idioms now, in the present.

In answer choice A, the word since requires that the verb has been expanding be in the present perfect tense because the universe started to expand after the explosive instant of the big bang (in the past), and it might still be expanding now, in the present.

The verb began is in the past tense because the universe began 10 to 20 billion years ago, in the past.

When you're trying to sort out a tense issue, always look for time indicators such as since and 10 to 20 billions years ago. Such indicators can help you to determine the correct tense.

Hope this helps!

_________________
Mitch Hunt
GMAT Private Tutor
GMATGuruNY@gmail.com
If you find one of my posts helpful, please take a moment to click on the "Thank" icon.
Available for tutoring in NYC and long-distance.
For more information, please email me at GMATGuruNY@gmail.com.

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diebeatsthegmat Legendary Member Default Avatar
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Post Fri Jul 09, 2010 3:41 pm
DERBY29 wrote:
The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.

A. that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding
B. that the universe had begun in an explosive instant 10 to 20 billion years ago and had been expanding
C. that the beginning of the universe was an explosive instant 10 to 20 billion years ago that has expanded
D. the beginning of the universe to have been an explosive instant 10 to 20 billion years ago that is expanding
E. the universe to have begun in an explosive instant 10 to 20 billion years ago and has been expanding


Can anyone help in answering this question? I do apologize the underline is from the word THAT to EXPANDING.

Many thanks.
clearly the answer must be A
because the first sentence uses " ago" and the second part uses "since" thus its tenses must be past simple and present progressive perfect tense

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Nina1987 Senior | Next Rank: 100 Posts Default Avatar
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Post Fri May 06, 2016 9:33 pm
Should the right wording be --> 'The widely accepted big-bang theory holds THAT the universe began in an explosive instant 10 to 20 billion years ago and THAT IT has been expanding' for parallelism sake and in terms of general GMAT preference ? @GMATGuruNY

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GmatKiss Legendary Member Default Avatar
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Post Tue Aug 16, 2011 12:36 pm
GMATGuruNY wrote:
DERBY29 wrote:
The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.

Many thanks.
The word "perfect" is a fancy grammatical term for "past".

has + verb (for a singular subject) and have + verb (for a plural subject) = present perfect = present past

The present perfect tense is used to describe the present in terms of a past action.


For example, one use of the present perfect tense is to describe an action that started in the past and might continue in the present:

Since the beginning of the year, John has memorized 100 GMAT idioms.

The word since indicates that John started to memorize GMAT idioms sometime after the beginning of the year (in the past) and that he might still be memorizing GMAT idioms now, in the present.

In answer choice A, the word since requires that the verb has been expanding be in the present perfect tense because the universe started to expand after the explosive instant of the big bang (in the past), and it might still be expanding now, in the present.

The verb began is in the past tense because the universe began 10 to 20 billion years ago, in the past.

When you're trying to sort out a tense issue, always look for time indicators such as since and 10 to 20 billions years ago. Such indicators can help you to determine the correct tense.

Hope this helps!
Hi Guru,

Please comment on the statements below. Do they make sense?

The widely accepted big-bang theory holds that all the planets in the solar system began in an explosive instant 10 to 20 billion years ago and have been expanding ever since.

The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and had been expanding for several billion years.

TIA,
GK

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Fractal Master | Next Rank: 500 Posts Default Avatar
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Post Tue Aug 16, 2011 12:04 pm
GMATGuruNY wrote:
DERBY29 wrote:
The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.

Many thanks.
The word "perfect" is a fancy grammatical term for "past".

has + verb (for a singular subject) and have + verb (for a plural subject) = present perfect = present past

The present perfect tense is used to describe the present in terms of a past action.


For example, one use of the present perfect tense is to describe an action that started in the past and might continue in the present:

Since the beginning of the year, John has memorized 100 GMAT idioms.

The word since indicates that John started to memorize GMAT idioms sometime after the beginning of the year (in the past) and that he might still be memorizing GMAT idioms now, in the present.

In answer choice A, the word since requires that the verb has been expanding be in the present perfect tense because the universe started to expand after the explosive instant of the big bang (in the past), and it might still be expanding now, in the present.

The verb began is in the past tense because the universe began 10 to 20 billion years ago, in the past.

When you're trying to sort out a tense issue, always look for time indicators such as since and 10 to 20 billions years ago. Such indicators can help you to determine the correct tense.

Hope this helps!
I don't understand, why "has expanded" is incorrect and "has been expanding" is correct. As far as I know, these two forms are both Present Perfect:

has expanded --> present perfect simple
has been expanding --> present perfect continuous

Can somebody explain, why the present perfect simple is incorrect here?

thx a lot!

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pradeepkaushal9518 Legendary Member
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Post Fri Jul 09, 2010 9:22 pm
one action in past and the second action is going on in that case use simple past in first action and present perfect in the second action.

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vamsidhar Newbie | Next Rank: 10 Posts Default Avatar
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Post Wed Jul 07, 2010 9:56 pm
@gmatmachoman,

As per MGMAt Sentence Correction Guide,one has to look for parallelism if you see "and" in a sentence. In that case,"has been expanding" should be parallel to a part of the sentence before "and", which is not the case here.


Please help me if i am missing anyhing.

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gmatmachoman Legendary Member Default Avatar
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Post Sun Jan 17, 2010 7:44 am
Usage of Present perfect tense:

Present perfect = Have/has + past participle.

If a event has taken place in the "past" and still continues to be true in the present then use Present perfect tense.

Here in this sentence:

Universe: subject
began: past tense.
has been expanding : present perfect tense.

SO A does the job.

@ aspirant 1:
E can't be the right option as " for the event that took place need to represented in "past tense" .A does that clearly.

navdeepbajwa:

I dont think " parallelism " plays any role here.This sentence deal with verb tense.

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thephoenix Legendary Member
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Post Sun Jan 17, 2010 7:22 am
aspirant1 wrote:
How about (E), have begun shows the event is still relevant today. But there is a "TO" before the verb "have begun" thats bothering...can someone throw light on this.
i think the biggest problem with have is that its plural and the universe( subj) is singular

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aspirant1 Senior | Next Rank: 100 Posts Default Avatar
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Post Sun Jan 17, 2010 7:15 am
How about (E), have begun shows the event is still relevant today. But there is a "TO" before the verb "have begun" thats bothering...can someone throw light on this.

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navdeepbajwa Senior | Next Rank: 100 Posts Default Avatar
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Post Sun Jan 17, 2010 3:16 am
expalnation for A is that Both verbs in the second clause
correctly take universe as their subject.

Can you please explain what that means and also what parts are parallel here i mean verb began is parallel with what .Also is expanding a modifier modifying universe

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