let us=let's cannot=can't could not=could't, must not=must't need not=need't I'd like to=I would like to I'm=I am he is= he's she is=she's it is =it's they are=they're there is=there's there are=there're do(es) not=do(es)n't will not=won't should not=should't this/that is=this/that 's these/those are =these/those're 现在只能想起这么一点,如果想起来了在加
