can,must,may的用法是

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can,must,may的用法是

情态动词其实没有什么死记硬背的,关键的解题方法就是看语气,所谓"情态",就是语气,这里随便给你举几个例子也许不全但你可以看看
can 可以表推测
One thing I can be sure about him is that he talks a lot.
也可以表能力
He is very strange.He can sit here for a shole day.
另外,不可能是 can't be
It can't be Tom's car because he cannot afford to buy a car.
may表示可能,语气比较委婉
May I please?
May I ask you a question?
She's not sure whether she will come tonight,so she may come.
You may record the lecture if you really have some difficulties listening to the teacher.
must是必须,有的时候也是语气很强硬的表现
Must you play piano now?It's only six!
You must obey the rules or you will be fired.
----Hey,do you have a minute?I have something to say...
----If you must

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