In response to higher oil prices, window manufacturers have

Question

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.

Swoosh617 · Answer

I think it comes down to what makes more sense:

"they are conserve energy" or "they do conserve energy"

dvinoth86 · Answer

Their windows(subject) are(verb) built to conserve energy, and they(subject) do(verb)    
Hence C.

keiraria · Answer

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

best regards

ChrisLele · Answer

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

.

thevenus · Answer

A) have been built to conserve energy,and they are
 have been is used when its built(in past,sometimes back) and continuously being built (and will continue in future) but we have to see that the oil price has hiked recently and the manufacturing can not be prompt enough to change the design the window.
and they are...is incomplete. 
B) are built to conserve energy,and they have
 and they have is incomplete too. 
C) are built to conserve energy,and they do
 Correct 
 are built is correct ,(a second action in response of the first) eg: In response of the bad words spoken,jon is fined by the headmaster. 
D) are being built to conserve energy,and have
 are being-unfit,and have-incomplete. 
E) have been built to conserve energy,and they are 
 same as (A)

yashii9 · Answer

A) have been built to conserve energy,and they are -  This means - they have already been built in recent past and will not be made in future  
B) are built to conserve energy,and they have -  1st statement - Correct present tense to convey that they are continuously made in present - 2nd - have is not a "to be" verb or main verb, its an auxiliary verb hence it does not complete the statement 
C) are built to conserve energy,and they do -  1st statement - Correct present tense - 2nd - it has main verb "do" which completes the action of what windows do? 
D) are being built to conserve energy,and have -  issues similar to A and B repeat 
E) have been built to conserve energy,and they are -  issues similar to A and B repeat

cssk · Answer

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"?

pqhai · Answer

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.

Bunuel · Answer

KAPLAN OFFICIAL EXPLANATION:

C

The windows in question "have been built to conserve energy, and they are." Are what? Conserving energy, of course. The verb that follows  are  is left out, but its meaning is implied. Problem is, the verb is  to conserve energy , not  conserving .  Are  makes no sense. You can't say "they are (conserve energy)." You have to say, "they do (conserve energy)," in (C).

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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

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