There is substantial evidence that certain forms of solar : GMAT Sentence Correction (SC)
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# There is substantial evidence that certain forms of solar

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There is substantial evidence that certain forms of solar [#permalink]

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25 Mar 2005, 01:32
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There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.

(A) either now or within a few years will be economically competitive with conventional sources of heat and power
(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now
(C) will be economically competitive with conventional sources of heat and power either now or within a few years
(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years
(E) are either now or will be within a few years economically competitive with conventional sources of heat and pow
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25 Mar 2005, 04:31
Future tense required. Thus 'will be' is required - B or C. i'll go with C. B has a disjointed sentence with the use of 'or are so now'

C it is.
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25 Mar 2005, 05:33
D) because of right usage of tenses "are...now" and "will be within a few years" and parallelism

C) is out because "will" refers to "now" as well as to the future. in this construct there is no proper split between the future and the present tense
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25 Mar 2005, 05:50
Folaa3 wrote:
What's wrong with (A)?

there is no verb in A) for the present tense ! "...now ???...." it should be "are" because it refers to "forms"
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25 Mar 2005, 08:03
(C) will be economically competitive with conventional sources of heat and power either now or within a few years

(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years

I would go with D. C cannot be right because you cannot say "will be now", only D has clear tense.
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29 Mar 2005, 21:08
Yes, OA is D. Thanks.
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30 Mar 2005, 09:19
(E) are either now or will be later
The position of "are" is clearly wrong, resulting two verbs for the second segment.
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30 Mar 2005, 13:30
HongHu wrote:
(E) are either now or will be later
The position of "are" is clearly wrong, resulting two verbs for the second segment.

2 verbs...hmm...I don't get it, can u plz elaborate Honghu...thx
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30 Mar 2005, 13:45
DLMD wrote:
(C) will be economically competitive with conventional sources of heat and power either now or within a few years

(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years

I would go with D. C cannot be right because you cannot say "will be now", only D has clear tense.

DLMD,

Can you further explain your answer here. Are we being tested for idiom or what?
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30 Mar 2005, 14:00
banerjeea_98 wrote:
HongHu wrote:
(E) are either now or will be later
The position of "are" is clearly wrong, resulting two verbs for the second segment.

2 verbs...hmm...I don't get it, can u plz elaborate Honghu...thx

Basically the terms following either and or needs to be comparable. If one is a verb the second should be a verb, if one is a noun the second should be a noun. In E the first is an adverb (now) but the second is a verb plus an adverb (will be later). The second verb is violating with the verb in the main stem.

Or look at it this way:
For either or sentences you could drop one of the two branches and the sentence still should be correct. For example: I'll take either the first or the second. The first branch is after "either": the first. The second branch is after "or": the second. The main stem is I'll take. So you have I'll take the first and I'll take the second.

With E: the first branch: now (after either); the second branch: will be later (after or). Main stem is "certain forms of solar energy are ... economically competitive."
First branch is "certain forms of solar energy are now economically competitive".
Second branch is "certain forms of solar energy are will be later economically competitive".
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31 Mar 2005, 08:49
Thx a lot Honghu, makes sense !
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31 Mar 2005, 10:23
patrickpui wrote:
DLMD wrote:
(C) will be economically competitive with conventional sources of heat and power either now or within a few years

(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years

I would go with D. C cannot be right because you cannot say "will be now", only D has clear tense.

DLMD,

Can you further explain your answer here. Are we being tested for idiom or what?

I am not sure whether we test idiom here, but I know it's about the tense of verb.

in C, the main stem is "will be ...heat and power". Refer to Ms. HongHu's post, the first branch is " will be now", the second branch is "will be within a few years."

You can never say Will be NOW because will be should be followed by a future times.
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31 Mar 2005, 16:50
HongHu wrote:
banerjeea_98 wrote:
HongHu wrote:
(E) are either now or will be later
The position of "are" is clearly wrong, resulting two verbs for the second segment.

2 verbs...hmm...I don't get it, can u plz elaborate Honghu...thx

Basically the terms following either and or needs to be comparable. If one is a verb the second should be a verb, if one is a noun the second should be a noun. In E the first is an adverb (now) but the second is a verb plus an adverb (will be later). The second verb is violating with the verb in the main stem.

Or look at it this way:
For either or sentences you could drop one of the two branches and the sentence still should be correct. For example: I'll take either the first or the second. The first branch is after "either": the first. The second branch is after "or": the second. The main stem is I'll take. So you have I'll take the first and I'll take the second.

With E: the first branch: now (after either); the second branch: will be later (after or). Main stem is "certain forms of solar energy are ... economically competitive."
First branch is "certain forms of solar energy are now economically competitive".
Second branch is "certain forms of solar energy are will be later economically competitive".

Needless to mention that was once again a great explanation
Re: SC- Solar energy   [#permalink] 31 Mar 2005, 16:50
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