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In response to higher oil prices, window manufacturers have

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In response to higher oil prices, window manufacturers have [#permalink] New post 06 May 2012, 11:00
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C
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90% (01:38) correct 10% (01:05) wrong based on 73 sessions
In response to higher oil prices, window manufacturers have improved the insulating capability of their products; their windows have been built to conserve energy, and they are.

A. have been built to conserve energy, and they are
B. are built to conserve energy, and they have
C. are built to conserve energy, and they do
D. are being built to conserve energy, and they have
E. had been built to conserve energy, and they are

In the second part of the sentence it is important to show the result, so why we can't use present perfect? Would appreciate it greatly if you could explain.
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Re: Oil prices [#permalink] New post 06 May 2012, 11:07
I think it comes down to what makes more sense:

"they are conserve energy" or "they do conserve energy"
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Re: Oil prices [#permalink] New post 07 May 2012, 07:29
malkov wrote:
In response to higher oil prices, window manufacturers have improved the insulating capability of their products; their windows have been built to conserve energy, and they are.

A. have been built to conserve energy, and they are
B. are built to conserve energy, and they have
C. are built to conserve energy, and they do
D. are being built to conserve energy, and they have
E. had been built to conserve energy, and they are

In the second part of the sentence it is important to show the result, so why we can't use present perfect? Would appreciate it greatly if you could explain.


Their windows(subject) are(verb) built to conserve energy, and they(subject) do(verb) [conserve energy]
Hence C.
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Re: Oil prices [#permalink] New post 07 May 2012, 09:20
malkov wrote:
In response to higher oil prices, window manufacturers have improved the insulating capability of their products; their windows have been built to conserve energy, and they are.

A. have been built to conserve energy, and they are
B. are built to conserve energy, and they have
C. are built to conserve energy, and they do
D. are being built to conserve energy, and they have
E. had been built to conserve energy, and they are

In the second part of the sentence it is important to show the result, so why we can't use present perfect? Would appreciate it greatly if you could explain.


I would pick C
Well what I think

the windows are built to conserve energy
it is a fact so we use the present form and
' They do' stand for they conserve the energy .

A wrong tenses use
B WRONG CONSTRUCTION
C ok
D ACKWARD with the use of being and have
E wrong use of past perfect


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Re: Oil prices [#permalink] New post 07 May 2012, 16:56
Expert's post
In this sentence the 'do' refers to the verb phrase 'conserve energy.' However, we do not have to repeat the 'conserve energy', as in, 'do conserve energy.' The ellipsis is the omission of the phrase 'conserve energy' as it is implied.

The verbs 'have' cannot function in this sense the way that the auxiliary verb 'do' does. In general when you want to refer back to a verb or a verb phrase, use 'do'.

Hope that helps :).
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Re: In response to higher oil prices, window manufacturers have [#permalink] New post 29 Nov 2013, 02:49
I agree C is right. But I have a doubt. Does choice C still hold true if "are built" is replaced with "have been built"?
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Re: In response to higher oil prices, window manufacturers have [#permalink] New post 30 Nov 2013, 00:55
cssk wrote:
I agree C is right. But I have a doubt. Does choice C still hold true if "are built" is replaced with "have been built"?


Hi csck.

Good question :). We can't use present perfect "have been built" here because of the intended meaning.
The intended meaning is that the windows are able to conserve energy NOW. it means the windows are complete products. If you use "the windows have been built....", you mean the building process has not completed yet. If the building process has not completed, how the windows can conserve energy? (the windows are still in testing step, for example). Thus, only simple present tense - "are built" - is correct.

Hope it helps.
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Re: In response to higher oil prices, window manufacturers have [#permalink] New post 30 Nov 2013, 04:17
Hi pqhai

Thanks. I got your point.
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Re: In response to higher oil prices, window manufacturers have   [#permalink] 30 Nov 2013, 04:17
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