There is no light in the dormitory.They must have gone to th
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There is no light in the dormitory.They must have gone to the lecture_____
1.didn`t they
2.don`t they
3.mustn`t they
4.haven`t they
要原因
1.didn`t they
2.don`t they
3.mustn`t they
4.haven`t they
要原因
![There is no light in the dormitory.They must have gone to th](/uploads/image/z/775518-6-8.jpg?t=There+is+no+light+in+the+dormitory.They+must+have+gone+to+th)
选4 havent they
关于must的疑问句应该根据实际情况而定.关于这道题应该对应下面的D条目下的第②条目下的第二点
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?
(二)陈述部分有表示过去的时间状语,疑问部分的动词就用
一般过去时.(didn’t + 主语)
She must have read the novel last week,didn’t she?她上星期一定读了这本小说了,是吗?
b 表示否定推测
表示推测时,否定式通常不是must not,而是can't (cannot).如:
He can't have been to your home; he doesn't know your address,does he?
他不可能去过你家;他不知道你的地址,是不是?
关于must的疑问句应该根据实际情况而定.关于这道题应该对应下面的D条目下的第②条目下的第二点
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?
(二)陈述部分有表示过去的时间状语,疑问部分的动词就用
一般过去时.(didn’t + 主语)
She must have read the novel last week,didn’t she?她上星期一定读了这本小说了,是吗?
b 表示否定推测
表示推测时,否定式通常不是must not,而是can't (cannot).如:
He can't have been to your home; he doesn't know your address,does he?
他不可能去过你家;他不知道你的地址,是不是?
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