概要：我们www.51jxk.com小升初频道为大家整理了一些小升初英语语法资料，希望对同学们有所帮助。英语语法知识总结：need"不必做"和"本不该做"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。)典型例题There was plenty of time. She ___.A. mustn't have

我们www.51jxk.com小升初频道为大家整理了一些小升初英语语法资料，希望对同学们有所帮助。

英语语法知识总结：need"不必做"和"本不该做"

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。)

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)。