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usage of DO - Please clarify the rule

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ngufo06
 Post subject: usage of DO - Please clarify the rule
 Post Posted: Fri Sep 02, 2011 10:41 pm 
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Students


Posts: 5
Dirt roads cost twice as much to maintain as paved roads DO

What can be second DO replaced by ? It is costs ?

Also why is this statement wrong ?
Maintaining dirt roads costs twice as much as paved roads DO.
why is DO in this statement not replacing MAINTAINING ?

please give me the rule here.

Thanks a lot.
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tim
 Post subject: Re: usage of DO - Please clarify the rule
 Post Posted: Wed Oct 19, 2011 5:14 pm 
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ManhattanGMAT Staff


Posts: 2242
Location: Southwest Airlines, seat 21C
"do" replaces "cost" in the first example. in the second example, "maintaining" is a noun and thus cannot be replaced by "do". the best way to express the second sentence is "Maintaining dirt roads costs twice as much as maintaining paved roads." you need to make sure the things you are comparing are parallel..

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Tim Sanders
Manhattan GMAT Instructor
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