情态动词(must,may,can,shall,might,could,will,should,need)引导的一般疑问

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