Subject pronoun + be
I am I'm
we are we're
you are you're
they are they're
he is he's
she is she's
it is it's
that is that's
Subject pronoun + have
I have I've
we have we've
you have you've
they have they've
he has he's
she has she's
it has it's
I had I'd
we had we'd
you had you'd
they had they'd
he had he'd
she had she'd
it had it'd
Auxiliary + not
have not haven't
has not hasn't
is not isn't
are not aren't
do not don't
does not doesn't
had not hadn't
was not wasn't
were not weren't
did not didn't
Modal + not
can not can't
could not couldn't
shall not shan't
should not shouldn't
will not won't
would not wouldn't
must not mustn't
might not mightn't
Question word + is
when is when's
what is what's
where is where's
who is who's
why is why's
how is how's