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1、Module 1,Grammar,选修6,Objective,学习和区别didnt need to do和neednt have done的用法。,John went to the station with the car to meet Mary,so she didnt 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 neednt 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
2、回家没有遇上John的车。）,didnt need to和neednt have done相同点是：两者都表示过去时间内不必做一件事。不相同点是：didnt need to do不必做(实际也没做)而neednt have done本不必做（但却做了）,There was plenty of time.She _.A.mustnt have hurried B.couldnt have hurriedC.must not hurry D.neednt have hurried答案D。neednt have done.意为“本不必”，即已经做了某事，而时实际上不必要。mustnt have do
3、ne 用法不正确，对过去发生事情进行否定性推断应为couldnt have done,“不可能已经”。,You neednt have spoken so slowly.Who said this the tourist or the English person?Why did she say it?Choose one of these possible reasons.The other person was speaking too quickly.The other person was speaking too slowly.The other person was speakin
4、g slowly and it wasnt necessary.,the tourist,Complete the sentences using didnt need to or neednt have done.,We brought some food to the party but there was too much,so we _(bring)any.My friend spoke good Mandarin so I(translate)_ the speech for him.,neednt have brought,didnt need to translate,3.The
5、 office had already opened when we arrived so we _(wait)outside in the street.4.I got to the party at 6 p.m.but there was no one there,so I _(arrive)so early.5.I told the host all about my home town and then he told me hed been there.I _(tell)him anything!,didnt need to wait,neednt have arrived,need
6、nt have told,Review,复习must/have to和mustnt/dont have to。,must和have to,must命令 强制口气have to是不得不，很勉强比较have to和must1)两词都是必须的意思，have to 表示客观的需要，must 表示说话人主观上的看法，既主观上的必要。My brother was very ill,so I had to call the doctor in the middle of the night.我弟弟病得很厉害，我只得半夜里把医生请来。(客观上需要做这件事)He said that they must work
7、 hard.他说他们必须努力工作。（主观上要做这件事）2)have to有人称、数、时态的变化，而must只有一种形式。但must 可用于间接引语中表示过去的必要或义务。He had to look after his sister yesterday.,dont have to和mustnt,dont have to=dont need to=neednt 表示“不必”mustnt 表示“禁止”，You dont have to tell him about it.你不一定要把此事告诉他。You mustnt tell him about it.你一定不要把这件事告诉他。,The weath
8、er turned out to be fine yesterday.I _ the trouble to carry my umbrella with me.(2006 江西)A.should have taken B.could have taken C.neednt have taken D.mustnt have taken,实战高考,2.As you worked late yesterday,you_ have come this morning.(2006 陕西)A.maynt B.cant C.mustnt D.neednt3.Did you return Freds call?I didnt need to _ Ill see him tomorrow.(2008 北京)A.though B.unless C.when D.because,4.Mark _ have hurried.After driving at top speed,he arrived half an hour early.(2010 天津)A.neednt B.wouldnt C.mustnt D.couldnt,Thank you.,
