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-'s1
1XX the short form of 'is' : 
John's here.What's that? She's writing a letter.
John's here.What's that?She's writing a letter.2XX the short form of 'has' : Polly's gone out. A spider's got eight legs.
Polly's gone out.A spider's got eight legs.3XX a short form of 'us' used only in 'let's'
4XX spoken a short form of 'does', used in questions after 'who',`what' etc that many people think is incorrect : How's he plan to do that?
How's he plan to do that?
