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1、Section Grammar探究 语法精要didnt need to do与neednt have done一、didnt need to do和neednt have donedidnt need to do和neednt have done两结构都有“过去不必做某事”之意。但didnt need to do是指“过去没必要做，实际上也没有做”；而neednt have done则表示“过去虽然没必要做，但已经做了某事”。I didnt need to buy a gift for my son because I already had one.我不需要为儿子买礼物，因为我已经有一份了。
2、I didnt need to clean the window.My brother did it.我没有必要擦窗户，我哥哥擦了。I neednt have told him about the news because he had known about it.我没必要告诉他这个消息，因为他已经知道了。2表示对过去事情的抱怨或后悔ought to have done 本来有义务做而没有做某事should have done 本来应该做而未做某事could have done 本来能够做而没有做某事need have done 本来需要做但未做某事neednt have done 本来没必
3、要做但做了某事You ought to have cleaned the room.After all，you were on duty yesterday.你本应该清理房间。毕竟，昨天该你值日。You should have been more careful just now.你刚才应该更小心些。Oh，Mom！You neednt have prepared so much food.Dad and Diana will not come back for supper.噢，妈妈！你本不必做这么多饭。爸爸和戴安娜不回家吃晚饭了。课时 语法专练.单句语法填空1It is obvious th
4、at the garden needs_ (water)答案：watering/to be watered2We dont need_(get) into an argument over this.答案：to get3It is said that he need not_(take) the exam.答案：take4A dog needs_(take) out for a walk every day.答案：taking/to be taken5I was the first to go there.I_(go) there so early.答案：neednt have gone6I
5、offered to help him with the housework and then he told me he had finished.I_(do) that.答案：neednt have done7My American friend Tom spoke good Chinese，so I didnt need_(translate) the speech for him.答案：to translate8Mark_(hurry)After driving at top speed，he arrived half an hour early.答案： neednt have hur
6、ried.完成句子1I_(不需要打出租车)；its within walking distance.So we walked there.答案：didnt need to take a taxi2It turned out to be a small house party.We _(没必要盛装打扮)答案：neednt have dressed up3They_(不需要做) it themselves，so they went home in advance.答案：didnt need to do4We_(没必要如此匆忙)There is still an hour left.答案：neednt have so hurried5Need he_(完成作业) first?答案：finish his homework6Must I tell Mary about it?No，you_(没必要)Ive told her already.答案：neednt谢谢观看！谢谢观看！
