有关mustn't和can'tHe ______ be at home,because the light is off.用can't还是mustn't?为什么?

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有关mustn't和can'tHe ______ be at home,because the light is off.用can't还是mustn't?为什么?

有关mustn't和can'tHe ______ be at home,because the light is off.用can't还是mustn't?为什么?
有关mustn't和can't
He ______ be at home,because the light is off.
用can't还是mustn't?
为什么?

有关mustn't和can'tHe ______ be at home,because the light is off.用can't还是mustn't?为什么?
是mustn't
两个都是推断
但是 mustn't 语气更肯定
他一定不再家,灯都没亮.
因为有根据 所以是比较肯定的那个

can't
mustn't表示禁止的意思,而can't才有推测他不在家的意思

can't
表否定猜测时,只能用can't

用can't
must 可以表示猜测(肯定),但mustn't 表示不允许.
can't 表示不可能

can't
must 表示推断时意思是一定 ,肯定;他的否定形式就是can't
mustn't 的意思是禁止 ,没有推断的意思

mustn't是必须不的意思,而can't表示不能够。

这题逻辑有问题啊?他不需要待在家,因为灯关了.......
用can't
mustn't语气强烈

can't can表示可能的时候用于否定和疑问,这个句子是典型的例子
must表示可能性很大,但用于否定是用can't,mustn't表示禁止做某事,不能用于推测的

can't
语感!

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