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最佳答案：may:yes,sb.may/canno,sb.may not/can'tmust:yes,sb.mustno,sb.needn't/mustn't(一般情况下
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最佳答案：Could...do...Yes,...can.No,...can't.May...do...Yes,...may.No,...mustn't/can't/ma
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最佳答案：must-Yes,you should./No,you needn't.need-Yes,you should/may/can/need./No.you nee
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最佳答案：还有musn't,表示禁止做,肯定回答用needmay的肯定回答用may 否定用can'tneed的肯定回答用need 否定用needn't或don't nee
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最佳答案：肯定回答 否定回答can can can'tcould can can'tmay can/may may not/ mustn'tmight can/might
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最佳答案：yes,you can./no,you can't.yes,you must./no,you needn't.yes,you need(must)./no,yo
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最佳答案：May I ...Yes,you can./No,you can't.Must I ..Yes,you must./No,you needn't.
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最佳答案：can 能,能够,有能力...must 必须/一定/一定要,must be一定是（表示有把握的推测）may可能,也许/可以（用于客气地询问是否可以做某事..）/