主动语态如何改成被动语态

Unit3LanguageinuseLanguagepracticePaperandprintinghavebeenusedforages.Thebatteryhasn’tbeenchangedforacoupleofmonths.Hasitbeenpublishedyet?现在完成时的被动语态:have/has(not)been+过去分词InformationcanbekeptonCD-ROMs.Bookscouldonlybeproducedoneatatime.Canbooksbereplacedbycomputers?情态动词的被动语态:情态动词(not)+be+过去分词当我们不知道谁是动作的执行者,或者没有必要指出谁是动作的执行者时,或者只需强调动作的承受者时,要用被动语态。被动语态:主语是动作的承受者。Conclusion(一)一般现在时—am／is／are+动词的过去分词一般过去时—was／were+动词的过去分词情态动词—aux.v.(must／can／could／may…+be+动词的过去分词被动语态的构成：be+动词的过去分词现在进行时——be(am、is、are)+being+动词的过去分词一般将来时——willbe／begoingtobe+动词的过去分词现在完成时——have／has+been+动词的过去分词时态被动语态结构一般现在时一般过去时现在进行时过去进行时am/is/are+donewas/were+doneam/is/arebeing+donewas/werebeing+done一般将来时过去将来时现在完成时过去完成时shall/willbe+donewouldbe+donehave/hasbeen+

donehadbeen+

done主动语态如何改成被动语态？主动语态的宾语改成被动语态的主语。2.主动语态的谓语动词改成被动语态的谓语动词。do→bedone3.注意保持时态和人称的一致。4.带双宾的谓语动词有两种改法。当把直接宾语改成主语时，谓语动词后必须加适当的介词:tofor.Conclusion(二)如:give→begivento此类动词还有:passshowsend…再如:buy→beboughtfor此类动词还有:makedrawcookmend…5.一些动词不定式在主动语态中省略to作宾语补足语,改成被动语态时,to必须还原。注:1.不及物动词（vi.)不用被动语态。如:happen、takeplace、appear、disappear…1.Myunclegavemeagiftonmybirthday.

2.Weoftenhearhimplaytheguitar．Iwasgivenagiftonmybirthday.Agiftwasgiventomeonmybirthday.Heisoftenheardtoplaytheguitar几种特殊结构注意:see,watch,hear,notice,feel,make,listento,lookat等动词/短语后作宾语补语的不定式都不带to；但改成被动语态后必须带to。Arecorder

isusedinourEnglishclasseveryday.

Let’spractice!recorderEnglishclassuse…forOftenplayFootball

isplayedallovertheworld.Acamera

isusedfortakingphotos.robyesterdaysenduplastyearAman-madesatellite

wassentupintospacelastyear.Abank

wasrobbedyesterday.mustplantcoverwithinafewyears’timeThetree

mustbeplantedontheground.Theground

willbecoveredwithtreesinafewyears’time.sendtorightnowatallgivesoonThey

willbesenttothehospitalrightnow.Atalk

willbegivensoon.digTheearth

isbeingdug

now.eatup

alreadyThefood

hasbeeneatenupalready.ExercisesCompletethesentenceswiththecorrectformofthewords.1.Ithinkonedaybooksmay________(place)completely.2.Mybike___________(leave)atschool,soIhavetotakethebustoschooltoday.3.Thebattery__________________(charge)yet.HowcanIusemyrecorder.hasbeenlefthasn’tbeenchargedbeplaced4.Papershouldnot_________(throw)away.5.Booksandothermaterialcan___________(borrow)fromthelibrary.6.I’veboughtasecond-handMP3player—andabout1,000songshave_______________(download)ontoit!beborrowedbethrownbeendownloaded7.Hasthecomputer____________(repair)yet?Ineedtowritemyarticlewithit.8.Whathave______________(turnon)?Theradio.beenturnedonbeenrepairedExercisesCompletethequizquestionsandchoosethecorrectanswer.Who/pyramids/build?

Whowerethepyramidsbuiltby?a)TheEgyptiansb)TheAncientGreeksc)TheRomans2.What/use/tomakepapersincethe19thcentury?Whatwasusedtomakepapersincethe19thcentury?a)Woodb)Silkc)Cotton3.Where/thestoryofRomeoandJuliet/set?WherewasthestoryofRomeoandJulietset?a)InNewYorkb)InAthensc)InLondon4.where/theworld’soldestbookprintedonpaper/discover?Wherewastheworld’soldestbookprintedonpaperdiscovered?

a)InIndiab)InChina c)InEgypt5.Howlong/computers/use?

Howlonghavecomputersbeenused?a)Forlessthan50years.b)For50yearsc)Formorethan50yearsExercisesMakequestionsandwriteanswers.What/shouldn’t/do/withpaper?(waste)--Whatshouldn’tbedonewithpaper?--Itshouldn’tbewasted.1.what/can/use/tomakepaper?(manythings)2.What/might/use/toreplacebooksoneday?(computers)3.how/must/printers/keep?(ingoodconditions)4.Where/can/music/keep?(onMP3players)Howhastheplacechanged?Usethesewords:add,change,open,paint,put,turnon,takeaway,ThewindowThecapThelightThebasketballThesweaterThepaintingTwochairsThebooksThedisheshave/hasbeenExercisesCompletethepassagewiththecorrectformofthewords.Fromabout500BC,pens_________forwriting.Thefeathersoflargebirds___________anddried.Thepointofeachfeatherwassharpened.call,clean,develop,introduce,invent,produce,spread,use,writewereusedwerecleanedThenpeopleusedthemtowritewithink.Manyfamousworks,suchasShakespeare’splays,______________withthesepens.Theninthe18thcentury,Apenwithasteelwritingpoint___________Onlyafewwordscould___________,however,beforethewriterhadtofillthepenwithinkagain.werewrittenwasinventedwereproducedManyyearslater,thefountainpen____________fromtheseearlypens.In1950,aEuropeancalledLaszloBiroinventedtheballpointpen.Thepopularityofwriting______quicklywiththe___________oftheballpointpen.Eventoday,ballpointpen,orBiros,asthey________,aremuchlessexpensive,comparedwiththefountainpens.spreadwasdevelopedarecalledintroductionExercisesCompletethesentenceswiththephrasesinthebox.1.CouldyouimagineadigitalimageofYaoMingonthewall___________aposter?ratherthanbyhand,forages,fromnowon,Iwonder,ratherthan2.Thingsmade_______areusuallymoreexpensivethanthoseproducedinfactories.3.________howoldbooksareactuallydownloadedontocomputers…4.Ihaven’tseenmybestfriend_______!5.We’reusingtoomuchpaper.___________,I’mgoingtoreadallmymagazinesonline.byhandfromnowonforagesIwonderAroundtheworldE-bookAswecansendmailbyemail,wecanreadbooksbye-booknow.E-booksfirs