need 不必做和本不該做

　needn't have done表示： 過去不必做某事, 但事實(shí)上做了。

　John went to the station with the car to meet Mary, so she didn't need to walk back home. 約翰開車去車站接瑪麗，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. 約翰開車去車站接瑪麗，所以她本不必步行回家了。 (Mary步行回家，沒有遇上John的車。)

典型例題

　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. 意為"本不必"，即已經(jīng)做了某事，而時(shí)實(shí)際上不必要。

　Mustn't have done 用法不正確，對(duì)過去發(fā)生的事情進(jìn)行否定性推斷應(yīng)為couldn't have done, "不可能已經(jīng)"。 must not do 不可以（用于一般現(xiàn)在時(shí)）。

【need 不必做和本不該做】相關(guān)文章：

面試時(shí)該做的和不該做的02-21

不必嘆息作文09-27

不必趨同作文07-09

生不必逢時(shí)作文02-12

不必羨慕別人作文03-04

不必?fù)?dān)心最初作文11-22

關(guān)于幫助他人 My View on Helping Others in Need02-27

和做家務(wù)相關(guān)的日記10-29

和筷子做朋友教案03-25

和9做游戲教案02-09