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I understand it should be

How does it compare

because the do has stole the s, but what is the reasoning behind it? I don't want to make the same mistake twice, so I feel I need to understand the reasoning.

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[smile]But it does compare, doesn't it?[/smile] –  smirkingman Jan 25 '11 at 8:39
    
@smirkingman yes, it kind of does ;) –  IAdapter Jan 25 '11 at 9:07

2 Answers 2

up vote 5 down vote accepted

Because, as with can or should, do is a modal verb, and as such it is always followed by a verb in its basic form: basic form being the verb without the introducing to.

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Compare can be transitive or intransitive.

Transitive, identifying differences:

John compared the two books and choose the larger

Intransitive, be comparable

The larger book just didn't compare with the little one

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