肯:Yes,you must/can/may/should/need to
否:No,you mustn't/can't/may not/shouldn't/needn't to
shall用于第一人称 回答一般可以用Sure./Good idea/Great./Why not?等
补充:have
否:No,you don't have to
肯:Yes,you must/can/may/should/need to
否:No,you mustn't/can't/may not/shouldn't/needn't to
shall用于第一人称 回答一般可以用Sure./Good idea/Great./Why not?等
补充:have
否:No,you don't have to