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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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06 Aug 2010, 06:29
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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 power

Please explain ur ans. I went with C.
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06 Aug 2010, 09:33
[quote="rohitgoel15"]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 power

I see the problem with C. "Now" signals the present tense of the verb "be."
If C was like "will be economically competitive with conventional sources of heat and power either shortly or within a few years then C would be the answer.
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06 Aug 2010, 09:47
There is evidence that certain forms of energy either are now competitive..............or will be in few years

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 - we cannot say 'will be competitive now'.....thats wrong tense
(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years - 'so' is for the task
(E) are either now or will be within a few years economically competitive with conventional sources of heat and power
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07 Aug 2010, 16:07
I was trapped between D and E, and then I saw what's wrong in E

if you put ''either'' after ''are'', in the latter, there couldn't be ''will be''

in A, ''now'' is incosistent with ''will be''

in B same reason for E

in C same reason for A

hope it's understandable
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15 Aug 2011, 06:46
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Hi all,
the trap is that C looks very attractive. but in C either X or Y are not paralel.
Unlike D (either + auxiliary verb + time) + (or + auxiliary verb + time), C is not parallel: either now (adjective) or within (preposition)

hope it helps.
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Re: There is substantial evidence that certain forms of solar [#permalink]

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15 Aug 2015, 16:36
Request you not to write your queries/answers/opinions in question window. It prevents ppl from analysing the question. The whole purpose of GMAT Club forum goes wasted by doing so.
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Re: There is substantial evidence that certain forms of solar [#permalink]

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10 Dec 2015, 19:33
rohitgoel15 wrote:
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.

let's analyze the question:
there is evidence
certain forms of SE will be economically competitive.
when will be? either now, or within a few years.

Error analysis:
although in A both "now" and "within few years" looks parallel, the verb that comes after that does not make sense with both entities.
SE now will be economically competitive...
if we are talking about the present, then why do we not use present simple? Moreover, now or within looks to me incorrectly placed.

(A) either now or within a few years will be economically competitive with conventional sources of heat and power
as mentioned above.

(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now
the verb before "either" is "will". the second entity of the idiom either x or y doesn't make sense with the verb. thus incorrect.

(C) will be economically competitive with conventional sources of heat and power either now or within a few years
again, same mistake. will be now...nope.

(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years
either are or will be - looks ok. worded ok, looks like we have a winner.

(E) are either now or will be within a few years economically competitive with conventional sources of heat and power
the same mistake as in B. the main verb is "are", then we have another verb "will be", are will be? nope!

D is the winner.
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There is substantial evidence that certain forms of solar [#permalink]

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15 Dec 2015, 20:47
Important thing in this question is that NOW is present tense and the use of the future tense WILL with now is not correct. The only option which does not have this issue is D.

rohitgoel15 wrote:
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 power

Please explain ur ans. I went with C.
There is substantial evidence that certain forms of solar   [#permalink] 15 Dec 2015, 20:47
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