七年级英语语法：need "不必做"和"本不该做"

英语学习能力的提高一直是大家所烦恼的一个问题，只有不断练习才会有进步。本文是小编为大家整理的七年级英语语法：need "不必做"和"本不该做"，希望大家阅读愉快。

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)。

本文就是www.xiaozhibei.com为大家整理的七年级英语语法：need "不必做"和"本不该做"，希望能为大家的学习带来帮助，不断进步，取得优异的成绩。