must be后面是动原吗

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must be后面是动原吗
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must be后面是动原吗
must be后面是动原吗

must be后面是动原吗
must 是情态动词,后面动原
must be ,be 已经是动词原形了.
如果是被动,就是must be done.
完成的,就是must have done./must have been done.(表肯定推测)

不是,应该是动词过去分词,如:The work must be finished in two days.

must 后面是动词原形
must be后面是形容词一般~

must 后面是动原
must be done