Unit5RevealingnatureUsinglanguage過(guò)去完成時(shí)課件高二英語(yǔ)選擇性

Unit5RevealingnaturePastperfectB4U5Step1：ReviewThreeminutestomemorize!Whatdotheyhaveincommon?Step2：LeadinWhichactionhappenedfirst?Whatdotheyhaveincommon?Byeighto’clocklastnight,Ihadfinishedmyhomework.ShehadbeenwaitingforthebusoveranhourwhenIfinallyarrived.Ihadthoughthewouldcometotheparty,buthedidn’tshowup.Ihadhardlysteppedintotheclassroomwhenthebellrang.Step3：Presentation基本用法11.表示在過(guò)去的某一時(shí)間或某一動(dòng)作之前完成的動(dòng)作。(過(guò)去的過(guò)去)nowpastfuture過(guò)去完成時(shí)hadfinishedByeighto’clocklastnight,Ihadfinishedmyhomework.基本用法2表示一個(gè)動(dòng)作或狀態(tài)在過(guò)去的某一時(shí)刻之前就已經(jīng)開始，一直持續(xù)到過(guò)去的這一時(shí)刻，并且到那時(shí)還未結(jié)束，仍有可能再繼續(xù)持續(xù)下去，常用的時(shí)間狀語(yǔ)有bythen,bytheendof,bythetime.ShehadbeenwaitingforthebusoveranhourwhenIfinallyarrived.nowpastfuture過(guò)去完成進(jìn)行時(shí)hadbeenwaiting基本用法3hope，mean，want，think，expect，suppose，intend，plan等詞的過(guò)去完成時(shí)表示未實(shí)現(xiàn)的想法、希望、打算或意圖，意為“本來(lái)...（但事實(shí)上沒(méi)有）”Ihadthoughthewouldcometotheparty,buthedidn’tshowup.nowpastfuture過(guò)去完成時(shí)hadthought基本用法4在句型hardly...when和nosooner...than中，主句用過(guò)去完成時(shí)，從句用一般過(guò)去時(shí)，表示“一......就......”Hardly

hadIleft

when

itbegantorain.我剛離開就開始下雨了。Nosooner

hadhesatdown

than

thephonerang.他剛坐下，電話鈴就響了。Completetheparagraphswiththeinformationfromthegivensentences.

a.Naturaldisastersledtofoodshortagesinthe1960s.

b.YuanLongpingbegantodoresearchonhybridrice.

c.YuanLongpingdevelopedabettertypeofrice.YuanLongping_____________todoresearchonhyaridricebecausenaturaldisasters______________foodshortagesinthe1960s.Intheend,he____________abettertypeofrice.beganhadledtodeveloped1Step4：PracticeCompletetheparagraphswiththeinformationfromthegivensentences.GregorMendelchosetostudypeaplantsbecausetheircharacteristicswereeasytocontrol.GregorMendelmadeimportantdiscoveriesaboutgenetics.GregorMendeldiedin1884GregorMendel___________studypeaplantsbecausetheircharacteristicswereeasytocontrol.Bythetimeofhisdeathin1894,he___________________discoveriesaboutgenetics.chosetohadmadeimportant2Completetheonlineencyclopediaentrywiththecorrectformofthewordsinthebox.LonesomeGeorgewasthelastPintaIslandtortoise.Hediedin2012.AfterGeorge’sdeath,thePintaIslandtortoisewasdeclaredextinct.

LonesomeGeorge百科全書條目Completetheonlineencyclopediaentrywiththecorrectformofthewordsinthebox.compete decline eatlive introduce arriveTheextinctionofthePintaIslandtortoiseisblamedonhumans.Beforehumans__________ontheisland,thespecies___________inisolationand___________theplantsthatnaturallygrewthere.Georgewasdiscoveredmanyyearsaftertheirarrival,andbythenhumans______________newspeciesthat_________forthefoodthetortoisesate.Aftergoatsinparticularhadbeenbroughttotheisland,thePintaIslandtortoisepopulation____________.Eventually,onlyGeorgeremained.arrivedhadlivedeatenhadintroducedcompeteddeclinedLookformoresentenceswiththepastperfecttenseinthereadingpassage.Itwasayoungmanwhohadleftmedicalschoolwithoutcompletinghisdegree...hehadrecentlyreceivedaletterfromhisfatherpredictingthathewouldbe“adisgracetoyourselfandallyourfamily.AfterDarwinhadspentsometimeinSouthAmerica,hisroomontheshipwascrowedwithsamplesoftheplantsandanimalshehadcollected.Atthattime,peoplebelievedthatallspecieshadappearedonEarthatthesametime,andhadnotchangedsince.Itseemedtheirbeakshadevolvedaccordingtowhatfoodwasavailableonthatparticularisland.Overtime,ithadslowlyevolvedintomanynewspecies.Step5：Productionpractice!Jane_________(watch)anaturefilmonTVwhensomeoneknockedonthedoor.OnourtriptoAfricalastyear,we__________(see)lionssittinginthetallgrasswatchingus.Thegirl,when_________(question)whyshe_________(cheat)intheexam,justloweredherheadandkeptsilent.Theboy_________(cry)loudlybecausehe_________(lose)hiswayinthejungleandthoughthecouldn’tgobackhome.Theyoungmaninsistedhe_________(do)nothi