关于need

来源：百度知道 编辑：UC知道 时间：2024/04/26 12:41:22
need have done的用法？need haven't done 和 needn't have done 的区别？

情态动词+have +done结构表示对过去动作的推测

need haven't done是"过去需要(应当)不去做",强调不做是必须的,比如

You need haven't told her the bad news.
你不应该告诉她这些坏消息

needn't have done是"过去不应当做某事",强调不用,不需要做某事.这个用法见的比较多
You needn't have told her the bad news.
你没必要告诉她这些坏消息

need一种是情态V 一种是实义V 作情态V时是need do sth 作实义V时 need to do sth

dict.baidu.com/s?wd=need 2012-11-5