have not

do not

would not

could not

did not

does not

can not

was not

had not

would have

should have

could have

might have

must have

what's

they've

how's

how'd

what had

that'll

when'll

we're

you'll

I'd

I'll

he's

she're

she'd've (colloquial)

tisn't (archaic)

we'd

he'd

she'd

I'm

I've

it's