高中英语《unit 3 computers》学案 新人教版必修2

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1、Unit3ComputersThe3rdperiod:learningaboutLanguage---thePresentPerfectPassiveVoiceGoals:1.LearnthePresentPerfectPassiveVoice.2.Helpthestudentsmasterthewayofusingthecorrectvoice,tellingthedifferencesbetweentheactivevoiceandthepassivevoice.TeachingProcedures:Step1:Revisionandlead-in1.Checkthehome

2、workfirstEx1:1totally　2revolution　3artificialintelligence4birth　5simple-minded 6goby 7dealwith 8network　9truly10anywayEx2:revolution;network; wentby;totally;truly;simple-minded;Anyway;dealwithEx3:1 totally 2amazed 3exciting 4excited 5cheaply6unlucky2.Lead-inSay:Areyoufamiliarwiththesecomputer

3、s?Canyoucallthem?(asktheSstodistinguishdifferenttypesofcomputers.)Doyouknowthesenewinventionsofcomputer?Awrist-wornPChasbeeninventedrecently.Apen-likecomputerhasalreadybeendeveloped.(showthemsomepicturesandaskthemtomakesomesentences,usingthePresentPerfectPassiveVoice.)Eg:It’sratherahotdaytoda

4、y!Wouldyouliketohaveaswimafterschool?HaveyoueverswumintheBlueWaterWorld（蓝色水世界）intheOrientalSuntown(东方太阳城)whichhasbeensetupinTaizhou?Thereabeautifulswimmingpoolhasbeenbuilt.Manyhighbuildingshavebeensetup.Lotsofflowersandtreeshavebeenplanted.Anewbridgehasbeencompleted….Step2:DiscoveringAsktheSs

5、todiscoverwhetherthesesentenceshavesomethingincommon..Helpthemtolearntheusefulstructure:thePresentPerfectPassiveVoice.Step3:Discussion:learningthestructureGivesomeexplanations1构成：主动语态被动语态现在完成时have/hasdone----------àhave/hasbeendoneHehasbeensenttostudythenewtechnologyinthecompany.Thedirtycloth

6、eshavenotbeenwashed.Havethewindowsbeencleaned?Howmanyshoppingcentershavebeenbuiltinthiscity?2.只有及物动词才有被动语态，不及物动词（词组）没有被动语态,如:happen,takeplace,die,appear,disappear,fail,remain,lie,last,sit,stand,breakout,cometrue,belongto等．如：Whathashappenedtoyourbrother?3．但许多不及物动词加介词或副词构成的短语动词，相当于及物动词，也可以有被动语态

7、。但短语动词是一个不可分割的整体，变为被动语态时，不可丢掉构成短语的介词或副词。如：ThechildhasbeentakengoodcareofbyGrandmaWangalltheseyears.AnoticehasbeenputuponthewallStep4:Practiceandexercises1.ChangethefollowingsentencesintothePresentPerfectPassiveVoice.!).Wehavecompletedallthepr