don not have to do sth.don not need to do sth.need notdo sth三个词组有什么区别?
问题描述：
don not have to do sth.don not need to do sth.need notdo sth三个词组有什么区别?
don not have to do sth.
don not need to do sth.
need notdo sth
三个词组有什么区别?
答
don not have to do sth 表示的语气较为强烈,have to为不得不,语气强烈
don not need to do sth不必要做某事 语气比don not have to do st弱一些
need not do sth 则为must的否定形式