题目内容：

didn`t need to do 和need not to do区别

优质解答

首先need既可作实意动词,又可做情态动词.做实意动词时,否定为don't need to做情态动词时,相当于can之类的,否定为need not do do not need to do sth不必要做某事,强调动作,语气比don not have to do 弱一些.need not...