Lets have a basketball match this afternoon, shall we?
Let us go out for a rest, will you?
12.当陈述部分带有情态动词must表示必须时,疑问部分用mustnt。如:
You must work hard next term, mustnt you?
I must answer the letter, mustnt I?
但若表推测这层含义时,不能用must,而要根据陈述部分的不定式结构(即must之后的动词)以及含义采用相应的动词形式。如:
You must have made a mistake, havent you?
They must have seen the film last week, didnt they?
He must be in the library, isnt he?
13.当陈述部分含有情态动词used to时,疑问部分可用usednt或didnt。如:
The old man used to smoke, didnt he?或usednt he?
Tom used to live here, usednt he?或didnt he?
14?当陈述部分带有情态动词ought to时,疑问部分用oughtnt或shouldnt。如:
He ought to know the answer, oughtnt he?
We ought to read this book, oughtnt we?或shouldnt we?
15.当陈述部分含有had better时,疑问部分用had。
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