Unit5RevealingnatureUsinglanguage过去完成时课件高二英语选择性

Unit5Pastperfect过去完成时1.定义2.结构3.时间状语4.用法Pastperfect一、定义表示在过去某一时间或动作之前已经发生或完成的动作。eg.Thetrainhadstarted

whenIgottothestation.eg.Bytheendoflastweek,shehadlearned10Englishsongs二、结构肯定：否定：被动：eg：She

said

she

had

graduated

fromuniversity.

eg.Ididn’tknowthewaytoJohn’shousebecauseIhadn’tbeentherebefore.eg.Theworkhadbeenfinishedbyhim

beforelastFriday.haddonehadnotdone=hadn’tdonehadbeendone三、时间状语by+过去的时间点

到...为止bytheendof+过去的时间点bythetime+过去的时间点bythen到那时before+过去的时间点

在...之前eg.Ihadfinishedmyhomeworkbeforesupper.eg.Bytheendoflastmonth,wehadfinishedhalfoftheproject.四、用法1.Itwas＋一段时间＋since从句(从句用过去完成时)自从...以来，已经多久了eg.Itwasthreeyearssincehehadjoinedthearmy.四、用法2.Itwasthe+序数词+time＋(that)从句

(从句用过去完成时)这是某人第几次做某事eg.ItwasthefirsttimethatIhadvisitedtheGreatWall.四、用法3.在“________________________________”句型中，主句用___________，从句用______________。译为“一......就......”eg.

Ihadnosoonerreachedhomethanitbegantorain.

eg.Hehadhardlylefthisofficewhenthetelephonerang.hardly...when/

nosooner...than/

scarcely...when过去完成时一般过去时四、用法4.want,hope,mean打算,plan,intend打算,expect希望,suppose以为,think以为

等动词的过去完成时可以用来表示过去未曾实现的愿望/打算/计划，意为“本想要/计划/以为”。eg.Ihadintendedtomeethimattheairport,butIhadanimportantmeetingtoattend.

eg.Ihadhopedtoseeheragain.ExerciseWe____________(paint)thehousebeforewemovedin.Paul_______(go)outwithJaneafterhehad

madeaphonecall.3)Tomsaidhe__________(read)thebooktwice.4)他说自从1989年以来他就在那家工厂工作。Hesaid____________________________since1989.5)我认为我一星期前就把信寄出去了。Ithought_____________________aweekbefore昨晚九点之前我已看完这本小说了。

______________________________bynineo'clocklastnight.hadpaintedwenthadreadhehadworkedinthatfactoryIhadsenttheletterIhadfinishedreadingthenovel

practice1.Jane_________(watch)anaturefilmonTVwhensomeoneknockedonthedoor.2.OnourtriptoAfricalastyear,we__________(see)lionssittinginthetallgrasswatchingus.3.Thegirl,when_________(question)whyshe_________(cheat)intheexam,justloweredherheadandkeptsilent.4.Theboy_________(cry)loudlybecausehe_________(lose)hiswayinthejungleandthoughthecouldn’tgobackhome.5.Theyoungmansaidhe_________(do)nothingwrong．6.Bytheendoflastyear,anothernewhospital_________(build)inourcity.waswatchingsawquestionedhadcheatedcriedhadlosthaddonehadbeenbuiltThetrain____________whenIgottothestation.(start)I____________thestationbeforesixo'clock.(reach)Bythetimewearrived,everyone____________medicalcare.(receive)I_____hardly_____homewhentherainpoureddown.(get)Itwasthethirdtimethathe____________thesamemistake.(make)They___________tohelpbutcouldnotgetthereintime.(want)Shesaidshe__________youyesterday.(see)Iwishedthathe___________hisinterview.(pass)hadstartedhadreachedhadreceivedhadgothadmadehadwantedhadseenhadpassedPractice1.Byyesterdaythey___________(work)forsixdays.2.Bythemiddleoflastmonthwe________(live)inBeijingforfiveyears.3.WhenIcametoGuangzhou,he________(be)thereforalongtime.4.Beforetheyarrivedherethefilm____already______(start).5.I____________(intend)tomeethimattheairport,butIhadanimportantmeetingtoattend.6.Heenteredtheroom,__________(turn)onthelightandreadaneveningpaper.7.Nosoonerhadhearrivedthanhe_______(go)awayagain.8.Itwasthethirdtimethathe___________(be)outofwork.9.Shereturnedthebookthatshe______________.(borrow)10.IthoughtthatI_________(see)himbefore.

PracticehadworkedhadlivedhadbeenhadstartedhadintendedturnedwenthadbeenhadborrowedhadseenCompletetheparagraphswiththeinformationfromthegivensentences.

a.Naturaldisastersledtofoodshortagesinthe1960s.

b.YuanLongpingbegantodoresearchonhybridrice.

c.YuanLongpingdevelopedabettertypeofrice.YuanLongping_____________todoresearchonhyaridricebecausenaturaldisasters______________foodshortagesinthe1960s.Intheend,he____________abettertypeofrice.beganhadledtodeveloped1Completetheparagraphswiththeinformationfromthegivensentences.GregorMendelchosetostudypea豌豆plantsbecausetheircharacteristics特征/性wereeasytocontrol控制.GregorMendelmadeimportantdiscoveriesaboutgenetics.GregorMendeldiedin1884GregorMendel___________studypeaplantsbecausetheircharacteristicswereeasytocontrol.Bythetimeofhisdeathin1894,he___________________discoveriesaboutgenetics.chosetohadmadeimportant2Completetheonlineencyclopediaentrywiththecorrectformofthewordsinthebox.LonesomeGeorgewasthelastPintaIslandtortoise平塔岛象龟.Hediedin2012.AfterGeorge’sdeath死亡,thePintaIslandtortoisewasdeclared宣布

extinct灭绝的.

LonesomeGeorge百科全书条目Completetheonlineencyclopediaentrywiththecorrectformofthewordsinthebox.

compete竞争，争夺 decline下降，减少 eatlive introduce引进 arriveTheextinction灭绝ofthePintaIslandtortoiseisblamedon归咎于humans.Beforehumans__________ontheisland,thespecies___________inisolation独立and___________theplantsthatnaturallygrewthere.Georgewasdiscovered发现manyyearsaftertheirarrival,andbythenhumans______________newspeciesthat_________forthefoodthetortoisesate.Aftergoatsinparticular尤其hadbeenbroughttotheisland,thePintaIslandtortoisepopulation种群____________.Eventually最终,onlyGeorgeremained保留.arrivedhadlivedhadeatenhadintroducedcompeteddeclined1Itwasayoungmanwhohadleftmedicalschoolwithoutcompletinghisdegree.(Para1)2Hehadrecentlyreceivedaletterfromhisfather.(Para1)3AfterDarwinhadspentsometimeinSouthAmerica,hisroomontheshipwascrowdedwithsamplesoftheplantsandanimalshehadcollected.(Para2)4Atthattime,peoplebelievedthatallspecieshadappearedonEarthatthesametime,andhadnotchangedsince.(Para3)5Itseemedtheirbeakshadevolvedaccordingtowhatfoodwasavailableonthatparticularisland.(Para4)Homework：Findmoresentenceswiththepastperfecttenseinthetext.

1.___________________（上周日，我本打算出去散步，但是在早上就开始下雨,intend）.SoIwenttothemovieswithmybestfriend.2.___________________________________（当我起床的时候，我的狗已经把桌子上我的早餐都吃了。bythetime）.ThenIwenttoseethefilm,hungry,3.______________________（但是当我到电影院的时候，电影已经放映20分钟了。beon放映）.4._____________________________（这是我第一次和我最好