带情态动词的主系表结构的反义疑问句句为什么用系动词 - 知识问答

带情态动词的主系表结构的反义疑问句句为什么用系动词来反问呢?

1个回答

这种结构是
must(could/might) be表猜测可根据具体情况
he must be a student,isn't he
you must be a student,aren't you
he nust have been in Beijing now,hasn't he
he must have been there yesterday,wasn't he?
he must be watching Tv now,isn't he?

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