UNIT 4 Amazing Science TOPIC 1 When was it invented Section B--被动语态

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1、UNIT4AmazingScienceTOPIC1WhenwasitinventedSectionB--被动语态被动语态的基本构成：be+动词的过去分词（be+done)1.一般现在时am/is/are+doneWecleantheclassroomeveryday.Theclassroomiscleanedbyuseveryday.Heputonacoat.Acoatwasputonbyhim.2.一般过去时was/were+doneHemadethekite.Thekitewasmadebyhim.3.一

2、般将来时shall/will/begoingto+bedoneTheywillplanttreestomorrow.Treeswillbeplantedbythemtomorrow.Heisgoingtowritealettertohismother.Aletterisgoingtobewrittentohismotherbyhim.4.现在完成时has/have+beendoneJimhasfinishedthework.TheworkhasbeenfinishedbyJim.5.含有情态动词的被动语态ca

3、n/may/must/should+bedoneIcanfindhim.Hecanbefoundbyme.被动语态的用法1.不知道动作的执行者是谁。这块手表是中国制造的。ThiswatchismadeinChina.2.没有必要指出动作的执行者每年都应该种更多的树。Manytreesshouldbeplantedeveryyear.3.需要强调或突出动作的承受者。世界上越来越多的人说汉语。Chineseisspokenbymoreandmorepeopleintheworld.4.句子的主语是动作的承受者。许

4、多房屋被冲走了。Manyhouseswerewashedawaybytheflood.主动语态变被动语态的方法（主语）（宾语）主动语态：动作的执行者+谓语动词的主动形式+动作的承受者被动语态：动作的承受者+谓语动词的被动形式+动作的执行者（主语）（宾语）说明：（1）要将主动句里的宾语变为被动句中的主语，若主动句中的宾语为人称代词，要将宾格变成主格。（2）把主动句中的主语变为被动句中的宾语，主格变宾格，并由by引导。（3)谓语动词变成相应的被动形式。补充部分1.主动结构表被动意义open，lock，write，

5、read，sell，wash，cut，burn，drive等词作不及物动词时，它们的主语为物，可以用主动语态表被动意义。Thiskindofshirtsellswell.2.look,sound,taste,smell等系动词用主动表被动意义。例：Itsmellswonderful.Mooncakestastedelicious.3.在beworthdoing中，doing表被动意义。例：Thisbookisworthreading.4.want/need/require+doing=want/need/r

6、equire+tobedone例：Mybikeneedsrepairing.=Mybikeneedstoberepaired.我的自行车需要修理。课堂练习（一）改写句子1.Weplanttreesinspringeveryyear._________________byusinspringeveryyear.2.Shepostedtheletteryesterday.____________________byheryesterday.3.MrTurnergavemeabirthdaypresent.____

7、___________abirthdaypresentbyMr.Turner.5.Youmayhandinyourhomeworktomorrow.______________________________byyoutomorrow.6.Sheisgoingtowritealetter.__________________________byher.TreesareplantedTheletterwaspostedIwasgivenYourhomeworkmaybehandedinAletterisgoin

8、gtobewritten1.Ifcitynoises____fromincreasing,people____shouttobeheardevenatdinner.A．arenotkept;willhaveto  B．arenotkept;have    C．donotkeep;willhaveto    D．donotkeep;haveto   2.Thefifthgenerationco