I am=I'm she is=she's he is=he's it is= it's what is=what's

we are=we're you are=you're they are=they're

there is=there's that is=that's

注意：there are书面上很少用缩写，this is也没有缩写形式。

含有not的时候：

is not=isn't are not=aren't can not=can't could not=couldn't do not=don't was not=wasn't were not=weren't will not=won't have not=haven't has not=hasn't had not=hadn't

其它情况：

I would/should/had=I'd you would/should/had=you'd we would/should/had=we'd

let us=let's my name is=my name's