人教版九年级英语全册Unit 6 When was it invented 被动语态教案

Teachingobjectives(教学目标):2.Emotionalobjectives(情感价值观)：通过学习，能够用被动语态表法。Teachingtools(教学准备)：多媒体课件Step1:leadin.3minutesStep2:Presentation20minutesTask1Whatisthepassivevoive?(5’)yEnglish2.Englishisstudiedbyus.TThefirstsentenceistheactivevoice,thesecondsentenceisthepassivevoiceLookatthetwosentencesagain,wecanfind:设计意图：通过举例引导学生总结出什么是被动语态！1)不知道或没有必要说明动作的执行者是谁。Somenewcomputerswerestolenlastnight.一些新电脑在昨晚被盗了。(不知道电脑是谁偷的)Thisbridgewasfoundedin1981.(2)强调动作的承受者，而不强调动作的执行者。nbyhimustbefinishedontime设计意图：学生总结跟读的过程中熟练掌握何为被动语态.Task2.被动语态的构成形式(5’)TAccordingtothesecondsentencepleasesumupthestructureofthepassivevoice.SswilllookatthesentenceagainandTleadthemtofindtheusageofpassivevoice.Englishisstudiedbyus.)ka.Thedeskismadeofwood.b.Thedesksaremadeofwood.设计意图：学生通过对比发现被动语态的句子的时态的变化，为下一步做铺垫。Task3被动语态的时态(10’)tThepassivevoiceindifferenttensesT.willshowthesentencesindifferenttensesonppt.andmaketheSs.toPPt.)(1)把主动语态的宾语变为被动语态的主语。(2)把谓语变成被动结构(be＋过去分词)(根据被动语态句子里的主语的人称和数，(3)把主动语态中的主语放在介词by之后作宾语，将主格改为宾格。例如：A.WestudyEnglish.BEnglishisstudiedbyus(4)含有情态动词的主动句变成被动句时，由“情态动词＋be＋过去分词”构成.Wecanrepairthiswatchintwodays.Thiswatchcanberepairedintwodays.养学生观察---总结---运用的能力。省去“to”的动词不定式时，在被动语态eg.主动Theymakeusdoallthework.eg.主动Weoftenhearhersingsongs.eg.主动Isawhimwalktoschool.e(让学生读下列内容，注意双宾语变被动语态的事项，如果时间允许请个别学生尽量能seewatchhearnotice设计意图：通过讲解和举例操练让学生对双宾语变为被动语态的情况进一步熟悉。Step3:consolidationandpractice12minutes在这个环节和学生一起做个小游戏，leftorright缓解一下大脑(2’)MaketheSstofillintheblacks.学生两人一组讨论后给出填空答案，教师和其他学生一起评判，给与鼓励，进行巩固练习。pleuseknivesforcuttingthingsKnives____________forcuttingthings.Thestudentscleanthewindowsoftheirclassroomtwiceamonth.Thewindowsoftheirclassroom_____________twiceamonth.3.Ifoundtheticketonthefloor.________________________onthefloor.4.Itoldhertoreturnthebookintime.She_____________toreturnthebookintime.5.Hisdoctormadehimhaveonlytwomealsaday.He___________________________onlytwomealsaday.6.Nowpeoplecanusecomputerstohelpthem.Nowcomputers___________________tohelpthem.Didyouplantmanytreesatthistimelastyear.Mustwefinishourworktoday?_______ourwork_____________today?9.Theforeignfriendsgaveussomewonderfulstamps._____________somewonderfulstamps.Somewonderfulstamps_______________________.TheteacheraskedTomtoturnonthecomputer.Tom_______________toturnonthecomputer.Inthisfactorywomendomostofthework.Mostofthework_______________bywomeninthisfactory.性的进行练习巩固主动语态变被动语态，要求熟用被动语态表达身边发生的事情，激发学生学习英语的兴趣，热爱生活。Step4:summary8minutesheSsTodaywehavelearned如果主语是动作的承受者，动词便用被动语态(PassiveVoice)。Eg.lassroomyesterdaynedbyusyesterday中的构成S+am/is/are+doneS+was/were+doneS+will／shall/begoingto+be＋doneS+can/may/must/should+be+done.主动语态变被动语态的方法(1)把主动语态的宾语变为被动语态的主语。(2)把谓语变成被动结构(be＋过去分词)(根据被动语态句子里的主语的人称和(3)把主动语态中的主语放在介词by之后作宾语，将主格改为宾格。例如：A.W