英语虚拟词need表达"不必做"和"本不该做"的意思，英语虚拟词need的用法在学习中是比较重要的知识点，生活中也是经常用到的，下面再来详细的介绍下need的用法。

　didn't need to do表示： 过去不必做某事, 事实上也没做。.

　needn't have done表示： 过去不必做某事, 但事实上做了。

　John went to the station with the car to meet Mary, so she didn't need to walk back home. 约翰开车去车站接玛丽，所以她不必步行回家了。

　John went to the station with the car to meet Mary, so she needn't have  walked back home. 约翰开车去车站接玛丽，所以她本不必步行回家了。 (Mary步行回家，没有遇上John的车。)

　虚拟词need的用法：典型例题

　There was plenty of time. She ___.

　A. mustn't have hurried　 B. couldn't have hurried　　C. must not hurry　 D.needn't have hurried

　答案D。needn't have done. 意为"本不必"，即已经做了某事，而时实际上不必要。

　Mustn't have done 用法不正确，对过去发生的事情进行否定性推断应为couldn't have done, "不可能已经"。 must not do 不可以(用于一般现在时)。

　现在关于英语虚拟词need的用法大家都会用了吗?要记得经常复习，熟记于心啊，还可以想办法和同学交流时用need造句，这样学的会更快。

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