反疑问句 There must be something in the bag _____?.

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反疑问句 There must be something in the bag _____?.
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反疑问句 There must be something in the bag _____?.
反疑问句 There must be something in the bag _____?.

反疑问句 There must be something in the bag _____?.
isn't it

isn't it?
用法讲
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 ...

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isn't it?
用法讲
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 。

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