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maymustneed反义疑问句exercise用法
1、在回答must开头的一般疑问句时,肯定回答用must,否定回答用needn't或don't have
to. 如:
1)―Must I finish my homework before eight o'clock? ―Yes, you must.
2)―Must I attend the meeting?
―No, you needn't(No, you don't have to). You can ask Tom to go instead.
2、在回答may开头的一般疑问句时,肯定回答用may,否定回答用mustn't. 如:
1)―May I watch TV after supper? ―Yes, you may. / No, you mustn't. 2)―May I stop here? ―No, you mustn't.
3、在回答need开头的一般疑问句时,肯定回答用must,否定回答用needn't. 如:
1)―Need we stay behind after school? ―Yes, you must. 2)―Need he go now? ―No, he needn't. must的反意疑问句
如果陈述部分含有表推测的情态动词must,其反问部分不能用情态动词,
应根据具体情况而定。
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:
We must go at once, needn't we? 我们必须立刻走,是吗?
C.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: ①表示肯定
You must have left your bag in the theatre, haven't you? 你一定是把包落在剧场了,是不是?
Aunt Liu must have got to the U.S.A. yesterday, didn't she? 刘大婶昨天准是到了美国了,对不? ②表示否定
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?
D.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? need
带情态动词need的反意疑问句,疑问部分常用need +主语。 We need not do it again, need we ?
当need 为实义动词时,疑问部分用助动词do + 主语。 She doesn't need to go home alone, does she? exercise 做名词用时分可数名词与不可数名词 当“练习,操”讲时,是可数名词
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