1、 在回答must開頭的一般疑問句時，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開頭的一般疑問句時，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開頭的一般疑問句時，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.
1、 在回答must開頭的一般疑問句時，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開頭的一般疑問句時，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開頭的一般疑問句時，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.