must的反义疑问句

为什么在You must have made the mistake,_______?答案是haven't you,而在They must have stayed at hotel last night,_______?的答案是didn't they呢?为什么不是hven't they呢?求解啊啊啊啊!!!要详细的!!在线等!!!!

你好。must在这里是表猜测的,解释为“肯定,想必一定”。教你一个简单的方法:
将must变成I am sure + 去掉must的句子,谓语动词随“当时”,看例句吧,这样更容易理解:
1 You must have made the mistake,haven't you ?
== I am sure you have made the mistake, haven't you?
2 They must have stayed at the hotel last night, didn't they?
== I am sure they stayed at the hotel last night, didn't they?
我相信,你已经看懂了。简单吗?
现在,你完成下面三句:
She must have been to the headmaster's office,___________?
She must have been in the headmaster's office (yesterday) ,____________?
She must have left before he arrived,___________?

(hasn't, wasn't, hadn't )
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第1个回答  2013-09-23
如需编辑回答或插入图片,请点击标题到问题详情页陈述部分有must 的疑问句,疑问部分根据实际情况而定。   
A.must表示“应该”,其疑问部分用mustn't(不应该),如:You must work hard next term, mustn't you ? 下学期你应该努力学习,对吗?   
B.must表示“必须”,其疑问部分用needn't(不必),如:They must finish the work today, needn’t they? 他们今天必须要完成这项工作,是吗?   
C.陈述部分含情态动词mustn't,表示禁止时,疑问部分就可以用must或may,如:You mustn’t stop your car here, must you? (may we?)你不能把车停在这地方,知道吗?   
D.must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?  
②对过去发生的动作或存在的情况的推测:  
a 表示肯定推测   
(一)句中陈述部分没有表示过去的时间状语,这时疑问部分中的动词就用现在完成时。(haven’t / hasn’t + 主语)   You must have told her about it, haven’t you? 你一定把这事告诉她了,是吗?
第2个回答  2013-09-23
she must have finished reading the novel last night,【didn't she 】?句中有时间的标志性短语 last  night,时态就只能用一般过去时,不可以用完成时。【反义疑问句肯定要根据时态,所以是didn't she 】陈述部分有must 的疑问句,疑问部分根据实际情况而定。   A.must表示“应该”7其疑问部分用mustn't(不应该)如:You must work hard next termfjn mustn't you ? 下学期你应该努力学习,对吗?   B.must表示“必须”,其疑问部分用needn't(不必),如:They must finish the work today39 needn’t they? 他们今天必须要完成这项工作,是吗?   C.陈述部分含情态动词mustn't,表示禁止时,疑问部分就可以用must或may,如:You mustn’t stop your car here, must you? (may we?)你不能把车停在这地方,知道吗?   D.must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?  ②对过去发生的动作或存在的情况的推测:  a 表示肯定推测   (一)句中陈述部分没有表示过去的时间状语,这时疑问部分中的动词就用现在完成时(haven’t / hasn’t + 主语)   You must have told her about it, haven’t you? 你一定把这事告诉她了,是吗?
第3个回答  2019-12-13
mustn't
you?
句子意思的
你一定对那个司机很生气
must表推测
反义疑问句用mustn't
sb
第4个回答  2019-07-05
首先,不能用"mustn't"来反问,因为它表示禁止的意思,所以没有这么问的……
其次,遇到"must"的反义疑问句,一般是看句子表达的具体时态,根据具体时态进行提问
即,过去时用“did/didn't”;现在时用"do/don't";将来时用"will/won't"等