完成时态的反意疑问句提问原则

完成时态的反意疑问句提问原则

首先要判断这个情态动词是不是表示猜测的,
不是表示猜测的就是用原来的情态动词
像你的这个句子
She would have been more agreeable if she had changed a little bit,wouldn't she?
明显就是一个虚拟语气的标志,不是猜测.
如果是表示猜测的,那又有两种情况.都不用情态动词了.
表示猜测的语气主要是看后文有没有表示过去的时间状语.
比如说.
she should have gone home ,haven't she?
对比一下,
she should have gone home last night,didn't she?
以上.
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?
She's never been to Sydney,________she?
A.has B.does
选A 这里的 's never been to 中的been可以看出用的是完成时态,因此应该是has
You have to wash the plates after meals ,________?
A.don't you B.haven't you
思路：这里不要被句子中的have to 的have所蒙蔽了,因为have to 是固定搭配,表示“不得不”的意思,其实句子是You do have to wash...但是现在这里的do 都是省略的,因此在否定中要把to 再表达出来,选A
或者可以这样看,have to 是一个动词,各种动词除了“am is are was were”等之类的 be动词 都是用do可以来表示,所以选A
我表达能力不是很好,这样说你可以明白吗,若是有疑问可以再提出