These are called Contractions. They are a way of shortening a word by omitting a letter or letters.

not ( n't )
don't
can't
isn't
aren't
wasn't
 hasn't
doesn't
hadn't
didn't
weren't
 haven't
couldn't
wouldn't
won't (will not)
is ('s )
that's
she's
 he's
there's
 it's
 will ( 'll )
I'll
he'll
 she'll
we'll
 you'll
have ( 've )
I've
 we've
 you've
would ( 'd )
you'd
he'd
 she'd
they'd
 we'd

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