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She must be in her room,________?改成反意疑问句.并解释一下这样改的原因.

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She must be in her room,________?改成反意疑问句.并解释一下这样改的原因.
并且解释一下什么时候用must's she来做,
Key:isn't she?
must与 be 连用,表示猜测、推测,在使用中要注意这个情态动词短语的两个方面.
1、反意疑问句:主语 must be...,be not 主语(代词)?类似的用法还有may be.
eg.They must be late,aren't they?
It may be in your pocket,isn't it?
2、否定句:must be 与may be 的否定形式为 can't be.
eg.They must be late.--(否定)They can't be late
It may be in your pocker.--(否定)It can't be in your pocket.
must 与行为动词连用,在变为反意疑问句的时候,就可以直接使用mustn't .
eg.He must finish it at once,mustn't he?