may,must的肯否回答是什么?

问题描述:

may,must的肯否回答是什么?

can't
needn't

can't
needn't/mustn't

may:yes,sb.may/can
no,sb.may not/can't
must:yes,sb.must
no,sb.needn't/mustn't(一般情况下用NEEDN'T,除非是一定不能做的)