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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?