must表示推测的时候要根据意思而不是根据形式来完成反义疑问句.must have +过去分词表示对过去的推测:他昨晚一定熬夜了,不是吗?推测过去,要用过去时态didn‘t
而不用must的肯定或否定形式.
再如:The boy must be Li Ming,isn't he?不用must如果把上句中的 must 去掉,还成立吗。去掉must 就不是表示推测了。就违背了原句的意思。
He must have stayed up late last night,didn't he 这里为什么用didn't he不用haven't he
He must have stayed up late last night,didn't he 这里为什么用didn't he不用haven't he
是 hasn't he
是 hasn't he
英语人气:905 ℃时间:2019-11-01 06:13:33
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