must have 的反问疑问

题目

must have 的反问疑问
You must have left your bag in the theatre,haven't you?你一定是把包落在剧场了,是不是?Aunt Liu must have got to the U.S.A.yesterday,didn't she?刘大婶昨天准是到了美国了,对不?两句话,前面同样是 must have为什么一个是haven't you
didn't she
怎么分辨

答案

当must+have done表示对过去的情况进行推测（一般句中有明确的过去时间状语）,问句要根据陈述部分谓语的情况用“didn't+主语”或“wasn't/weren't+主语”；如果强调动作的完成（一般没有明确的过去时间状语）,问句要用“haven't/hasn't+主语”.
She must have read the novel last week,didn't she?
她上星期一定读了这本小说,是吗?
You must have told her about it,haven't you?
你一定把这事告诉她了,是吗?