情态动词反意疑问句

Question

反意疑问句的主句里如果有情态动词和完成时态(有可能还有否定形式),那么反意疑问句怎么变?最好具体点.

Answer 1

一般情况下是和普通反意疑问句一样,在情态动词上改,比如.

You can play piano, can't you?
He can't go to school today, can he?

但注意下列情况:

1 当陈述部分带有情态动词ought to时，反意疑问部分在英式英语中用ought to 形式，在美式英语中用should形式。例如：

You ought to see the new picture,shouldn't you?

Teachers ought to be honoured,oughtn't they?

2 当陈述部分带有情态动词used to时，反意疑问部分可以用used to形式，也可以用did形式。例如：

She used to live abroad,usedn't she?

There used to be a newsstand in the corner of the street,didn't there?

3 当陈述部分带有情态动词must时，反意疑问部分需视must的含义而定。

a.当must表示“命令或强制”时，反意疑问部分用mustn't。例如：

You must do it by yourself,mustn't you?

b.当must表示“有必要”时，反意疑问句用needn't，例如：

You must see him tonight,meedn't you?

c.当must表示“一定”或“想必”等推测意义时，反意疑问部分不用mustn't，而根据must后的动词形式而定。例如：

He must be crazy to do so,isn't he?

She must have been there for a long time,hasn't she?

They must have stayed at home last might,didn't they?

4 当陈述部分带有need时，反意疑问部分需视need的含义而定。如果need用作情态动词，则反意疑问部分用need形式；如果need用作实义动词，表示“需要”，则反意疑问部分用do形式。例如：

You needn't go there,need you?

She needs to fo there,doesn't she?

Plants need sun to grow,don't they?

Answer 2

陈述部分有must 的疑问句，疑问部分根据实际情况而定。
He must be a doctor, isn't he?
You must have studied English for three years, haven't you? / didn't you?
He must have finished it yesterday, didn't he?

否定词移位的情况，如：
I don’t suppose (that) he is serious, is he?
陈述句是否定形式时，简短问句中动词的选择则由陈述句中的动词形式而定。例如：
He hasn’t a house of his own, has he?
He doesn’t have a house of his own, does he?
在否定的祈使句后， 只能用will you。例如:
Don’t forget, will you?

具体的可以看看http://baike.baidu.com/view/201301.htm

里面说的很详细，我抽出来的是你问的部分，但是我觉得你还可以看看，
就能理解的更详细了。因为你没有给例句，自己看了就更清楚。

参考资料：http://hi.baidu.com/仓之猪