关于mustn't can't shouldn't

Question

如题所述

Answer 1

mustn't
不许——表示强制性质很强，比如说法律，校规等；
can't
不能——能力上达不到
shouldn't
不应该——原则上的把握，性质没有mustn't那么强硬。
1
shouldn't
2
mustn't
3
can't

Answer 2

can't
不可能
mustn't
不必
shouldn't
不应该
he
can't
be
in
the
room,
i
didn't
see
him.
他不可能在屋子里，我（刚才）没有看见他。
从意思上看就知道用can't
是正确的。