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Example : He isn't tired but she is. Why can't use "she's"? Why is "she is" used?

marked as duplicate by Edwin Ashworth, JJ for Transparency and Monica, J. Taylor, David, Phil Sweet yesterday

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  • The difference is that she's and similar shortened forms are used in colloquial speech, but not in certain cases. In your example, she is being emphasised. – Kate Bunting Nov 8 at 9:09
  • Short form can stand for, say, She's a good student; She's got good memory, (She is... & She has...), whereas, 'She is...' can have only single interpretation. – Ram Pillai Nov 8 at 12:20

I don't think it would ever be proper to end a sentence with "she's" (see the link @JR posted as a comment to your question for a detailed explanation).

Other than that, the contraction can be used interchangeably. Good to note though that contractions are generally more informal/colloquial. So maybe you would say to you friend "She's my supervisor." But in a formal work report, you might say "She is my supervisor."

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