2008年5月12日第53期英语语法讲解，让你在不断积累中提高，能力提高就这么简单，每日一期，敬请关注
need "不必做"和"本不必做"
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。
例如：
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步行回家了，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
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