- 问一个反意疑问句Ithinkhemustbeadoctor反意疑
- I think he must be a doctor反意疑问句是什么?上的答案是doesn't he.......为什么啊??????
- 这道题，个人认为给的答案不正确。
首先，这是个I think引导的宾语从句，反意疑问句要和从句保持一致，这点看来你已经明白。
其次，是关于must的反意疑问句的构成问题，你需要掌握下面的几个步骤。虽然must的反意疑问句有点难，不过也有定的规律可用：
1.当陈述句谓语动词是:must+have+done时,如果是对过去某种情况的推测,且句中有过去的时间状语时,反意疑问句根据动词用:didn't/wasn't/weren't+主语.eg.:
(1)You must have read the story last term,didn't you?
(2)He must have met her yesterday,didn't he?
2.当陈述句谓语动词是:must+have+done(过去分词)时,如果只是强调动作的完成情况,反意疑问句用:haven't/hasn't+主语.eg.:
(1)She must have arrived there,hasn't she?
(2)You must have seen the film,haven't you?
3.当陈述句谓语动词是:must+do(动词原形)时,是最为复杂的,看下面的例句:
(1)You must see the doctor,needn't you?
表示“(主观上)必须”，其疑问部分用needn't（不必），如：
We must go at once, needn't we?
我们必须立刻走，是吗？
(2)You mustn't do that again,must you?
表示“应该/不应该”或"禁止"，其疑问部分用mustn't（不应该）/must(应该)，如：
You must work hard next term, mustn't you ?
下学期你应该努力学习，对吗？
陈述部分含情态动词mustn't，表示禁止时，附加疑问部分就可以用must或may，如：
We mustn't be late, must we?(may we?)
我们不可以迟到，是吗？
(3)The food must be nice ,isn't it?
表示推测，其疑问部分必须与must 后面的主要动词相呼应。如：
1）对现在动作或存在的情况的推测：
You must know the answer to the exercise ,don't you?
你一定知道这项练习的答案，是不是？
That must be your bed, isn't it?
那一定是你的床，是吗？
总结:
1.陈述部分有must，且表示"必须"时，附加疑问句部分用mustn't.
2.如果表示"必要"则用needn't.
3.陈述部分中是mustn't表示"禁止"时，附加疑问句部分用must.
4.陈述部分中的must表示"一定"、"想必"等推测意义时，附加疑问句部分而是根据陈述部分的谓语动词或其助动词来定。
练习:
推断用法：He must be lying to me.
推断用法反意疑问句：He must be lying to me, isn't he?
陈述用法：He is lying to me.
陈述用法反意疑问句：He is lying to me, isn't he?
推断用法：He must have been abroad.
推断用法反意疑问句：He must have been abroad, hasn't he?
陈述用法：He has been abroad.
陈述用法反意疑问句：He has been abroad, hasn't he?
推断用法：He must have gone swimming yesterday.
推断用法反意疑问句：He must have gone swimming yesterday, didn't he?
陈述用法：He went swimming yesterday.
陈述用法反意疑问句：He went swimming yesterday, didn't he?
He must be a visitor, isn't he?(对现在情况的推测)
You must have seen him at his birthday party yesterday, didn't you?(对过去情况的推测,且句中有过去的时间状语)
You must have seen him at his birthday party,haven't you?(强调动作的完成)