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我们老师说must have done 是对过去所发生的事作肯定猜测。
例句:1,he must have finished his homework,hasnt't he?
2,he must have cleaned the room just now,didn't he?
这是我笔记本上记得,老师说前面有具体时间时,用系动词来作反意疑问句,现在第一句没有时间词,为什么还要用hasnt't he?
我在课外书上看见有这么一句 i must be off now,mustn't i?又这么解释
终于打完了,捏了一把汗。
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