can't be 与 must be的区别

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can't be 与 must be的区别
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can't be 与 must be的区别
can't be 与 must be的区别

can't be 与 must be的区别
can be是指可能会,可能是,表示可能性
例:That can be true.那可能是真的.
在推测时,语气肯定的否定,用 Can't be.
例如:It can't be my book.它不可能是我的书.
must be指一定会,准是,一定是,表不可避免性,必然会,必定会.
例:He must be there by now.他现在一定在那里了.
而must用于否定时,一般没有mustn't be,而是mustn't do,意思是禁止干什么
例如:You mustn't go out at night.你不能在晚上出门.(意思就是禁止你在晚上出门)
再例如:excuse me,you mustn't smoke here.对不起,这里禁止吸烟.

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