英语语法求救

Question

1，You think he is a doctor,do you?
都号后面的怎么改？ 是doesn't he 还是。。、
2,You must have been there before,hadn't you?
后面的到底是didn't you还是 haven't you？
为什么请解释
3，You must have read the book yersterday,haven't you?
这里面的 haven't you?又怎么改？

Answer 1

【答案】
You think he is a doctor,don't you?
You must have been there before,haven't you?
You must have read the book yesterday,didn't you?

【解析】涉及到翻译疑问句的一些语法点：
1、You think he is a doctor,don't you?
谓语动词是think，believe，imagine，suppose……等带有宾语从句，且主句主语为【第一人称】时，疑问部分和宾语从句谓语保持一致

显然这里主句主语you不是第一人称，遵守常规，疑问部分和主句保持一致

2、You must have been there before,haven't you?
句子中含有must 表示猜测的反义疑问句，疑问部分应与【must后的动词所表示的时间一致】。

补充：
must+ have done 对过去情况有极大的把握的猜测

have been there 去过那里，本来就是个完成的动作，遵守时间一致（完成时）→haven't you?

3、You must have read the book yesterday,didn't you?
同2：
read the book yersterday 表示过去的动作（时间状语yesterday），遵守时间一致（过去时）→didn't you?

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Answer 2

don't you?
反问的是你认为 这件事, 你的观点, 而不是后面从句.
haven't you?
现在完成时表示现在为止的一个状态
前面是have been, 反问就是haven't you?

最后一个didn't you?
因为有明显的时间词yesterday,表示句子为过去式.

Answer 3

第一句是don't you?
句子是you think开头，所以反意疑问句是针对you的。这要死记。
假如是I think开头，那么反意疑问句要针对he，这也是死记。
第二句hadn't you?
句子意思是几乎肯定的猜测“你以前到过那里”，针对you had been there before提问，当然是hadn't you了
第三句也是hadn't you?

Answer 4

1 此题考 反意疑问句 ，首先，句子主干是肯定，所以，后面要否定
其次，you 第二人称，后面跟think 时，以后面句子主语为主，而从句是is ，所以要用的是 isn't he 。（如果是she thinks ……后面应该是doesn't she）

2 此处must表推断，所以 根据后面动词决定，再加之是表示完成时的before ， 所以用到的是haven't you
3 因为yesterday 是一般过去时的标志，所以后面 不用完成时，而用 didn't you 。
学习愉快！