must 的三种反义疑问句
既然多数人感到麻烦我就来讲一讲must反义疑问句的用法。
你记住，must反义疑问句就三种可能：
①must
②needn't
③变换句式
下面来讲一讲他们分别的用法，一般考试就这三种可能！
1、mustn't→must
mustn't在陈述句中的意思一般是不允许，禁止，所以他的反义疑问句用must或may
例：You mustn't smoke here, must you?或may you?
2、必须→needn't
当must在陈述句中作“必须”解时，它的反义疑问句就变成needn't
例：You must go now ,needn't you?
3、变换句式
在must表示推测，做“一定，准是”，简单的说就是must用于虚拟语气时
像数学一样我们引入一个“常量”——I am sure that
下面就能你那句话作为例子，我们变换一下。
He must have come yesterday. 变换句式作
I am sure that he came yesterday. 好我们应该分清，反义疑问句问的应该是I am sure that 后面的从句
所以，按照一般反义疑问句的规则得出结果
I am sure that he came yesterday, didn't he?
最后再把句子还原
He must have come yesterday，didn't he?
此题解答完毕。
下面是我搜索英国和美国语料库的结果：
英国语料库：Davies, Mark. (2004-) BYU-BNC: The British National Corpus. Available online at /bnc.
1. I was just thinking I bet that Helen was pleased then cos she must have passed, mustn't she?
2. Yes. Now it must have been mustn't it, a possibility, if been there at all, that he was hiding under that bed?
3. Exactly why, he must have had some sympathy, mustn't he?.
4. …she must have passed mustn't she?
5. He must have been interested in cooking, mustn't he?
6. Yeah well I mean he must have gone in the hospital to her mustn't he?
8. You must have touched her up the wrong way. --Yeah, I must have done mustn't I?
9. Now it must have been mustn't it, a possibility, if been there at all, that he was hiding under that bed?
10. Exactly why, he must have had some sympathy, mustn't he?.
11. He must have been interested in cooking, mustn't he?
12. Yeah well I mean he must have gone in the hospital to her mustn't he?
13. Yeah, I must have done mustn't I?
14. Somebody must have reported him, though, mustn't they?
15. Abruptly she stood up and crossed to the window. "I must have done , mustn't I?"
16. You must have seen the seals, though, didn't you?
17. Exactly why, he must have had some sympathy , mustn't he ?.
18. And your sister's ten years older than you so they must 've been there ten years plus , mustn't they ?
19. They have a serious side but they must have a lighter side as well , mustn't they ?
20. It must be , mustn't it ?
21. Yeah. The profit would have been minus cos the costs would still be there so it must be a cancellation . Mustn't
it ?
22. Yes, now this shows it must be his imagination , mustn't it ?
23. …they must know there is a risk , mustn't they .
24. It must mean something , mustn't it ?
25. Six pairs of knickers must be enough , mustn't it , Charlie?
26. Then it must be Madame V in Paris , mustn't it ?
27. Everybody who sees her must love her , mustn't they , Ellen?
28. But he must like her a bit , mustn't he ?
29. Saturday night. Yeah? Yeah. So he must be doing well, mustn’t he?
30. Yeah. Okay. So what, they mus t be staying, staying the Saturday night, mustn’t they?
31. You must have seen the seals, though, didn’t you?(用didn't的只搜到这一例)
美国语料库：/
1. You must have enjoyed those, didn't you?
2. And you must have had a name, didn't you?
3. Oh Patrick, I must have told you -- didn't I?
4. Must have seemed like an eternity, didn't it, holding your breath?
5. Must have had three kids, did she?
6. I'm sure they must be exaggerating, aren't they, Professor?
7. You must have called an undertaker by now, haven't you?
还是英国语料库：
推断：
