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Possible Duplicate:
Is there some rule against ending a sentence with the contraction “it's”?

Why is it that the following sounds incorrect:

"Would she know where it's?"

But this sounds fine:

"Would she know where it is?"

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marked as duplicate by Marthaª, F'x, RegDwigнt Mar 24 '11 at 10:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 2 down vote accepted

Because you don't contract away a stressed syllable. It's counter to the very nature of contraction.

See also the answer to Is there some rule against ending a sentence with the contraction "It's"?

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