情态动词的回答
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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.