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Intern
Joined: 05 May 2012
Posts: 16
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In response to higher oil prices, window manufacturers have [#permalink]
 06 May 2012, 12:00
Question Stats:
96% (01:24) correct
3% (01:23) wrong based on 29 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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Manager
Joined: 19 Mar 2012
Posts: 158
Location: United States
Concentration: Finance, General Management
GMAT 1: 750 Q50 V42
GPA: 3.69
WE: Analyst (Mutual Funds and Brokerage)
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I think it comes down to what makes more sense:
"they are conserve energy" or "they do conserve energy"
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Manager
Joined: 19 Oct 2011
Posts: 135
Location: India
Followers: 2
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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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Intern
Joined: 05 Apr 2012
Posts: 45
Followers: 0
Kudos [?]:
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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 best regards
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Magoosh GMAT Instructor
Joined: 28 Nov 2011
Posts: 305
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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  .
_________________
Christopher Lele
Magoosh Test Prep
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