Edison must have been very clever,wasn’t he?

Edison must have been very clever,wasn’t he?

题目
Edison must have been very clever,wasn’t he?
这个句子中的疑问部分是不是错了,是不是应改为hasn’t he
如果不是,那为什么呢,不是根据must后面的动词形式决定的吗?
答案
用must表推测的反意疑问句的有关用法
1)对现在情况的推测,问句部分用主动词(do,be)一般现在时的适当形式.若是现在进行时,问句部分用现在进行时的适当形式表示.若是there be结构,问句用isn't/aren't there.如:
1)He must be there,isn't he?
2)He must have a big family,doesn't he?
3)He must be waiting outside,isn't he?
4)There must be some students in the room,aren't there?
2)对已发生的过去情况的推测,若陈述句谓语部分有“must have done”,而且有表示过去的时间状语,问句部分用didn't;若没有表示过去的时间状语,问句部分用haven't或hasn't.如:
1)They must have gone there last night,didn't they?
2)They must have arrived by now,haven't they?(根据by now来判断)
3)They must have been to the Great Wall,haven't they?
3)若是被动,应按被动结构来处理.如:
1)The room must have been cleaned yesterday,wasn't it?
2)The room must have been cleaned,hasn't it?
4)若句中有表示过去完成时的时间状语,问句部分应用hadn't.如:
They must have learnt 5000 English words by the end of last term,hadn't they?
(本题中must表推测,如果将它去掉,还原为真实句就是They had learnt 5000 English words by the end of last term.因此,反意问句是hadn't)
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