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't
He ______ 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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