Unit-3-Online-tours-Grammar公开课课件牛津译林版八年级英语下册

GrammarUnit3OnlinetoursSimplepasttenseandpresentperfecttense一般过去时构成用法常用时间状语动词的过去式1.表示过去某个时间发生的动作或存在的状态。2.表示过去经常或反复发生的动作。yesterdaylastnightin1990twodaysago…现在完成时：表示过去发生或已经完成的某一动作对现在造成的影响或结果，或从过去开始一直延续到现在的动作或保存的状态。结构：主语+have/has+动词的过去分词一般疑问句：have/has…?Yes,Ihave.No,Ihaven’t.Yes,shehas.No,shehasn’t.现在完成时动词构成have/has+v过去分词助动词否定haven’thasn’t疑问Haveyou…?Hashe…?常与下列时间状语连用：just,already,yet,ever,never,before,severaltimesHehasreadthatbook.(说明他现在知道那本书的内容。)Hereadthatbooklastyear.(只说明他去年读过那本书。)HehasgonetoAmerica.(他现在不在此地，到美国去了。)HewenttoAmerica.(只说明他去过美国。)•现在完成时：表示过去发生或已经完成的某一动作对现在造成的影响或结果，或从过去开始一直延续到现在的动作或保存的状态，强调的是现在的情况，不能和表示过去的时间状语连用（如：in1990，lastSunday等）。•一般过去时：一般过去时只表示过去的动作或状态，和现在不发生关系（即动作或状态在现在已经结束），它可以和表示过去的时间状语连用。现在完成时与一般过去时的区别：have/has+V过去分词Ihavewaitedforhimformanytimes.我等他等了好几次了。Ihavebeenwaitingforhimforanhour.我等他等了一小时。Hehasdrunksixcupsofcoffee.他喝了六杯咖啡。Hehasbeendrinkingcoffee.他一直在喝咖啡。现在完成时把过去的动作和现在的结果联系起来，一般过去时只限于表示过去的动作本身,与现在的结果无关。现在完成时与一般过去时在意义上的区别举例如下：Ihavecleanedmyroom.(Myroomiscleannow.)我已经打扫过我的房间了。Icleanedmyroomlastweek.(Ididitinthepast.)我上周打扫了我的房间。FatherhasgonetoAmoy.(HewenttoAmoyandheisnotherenow.)爸爸已经去厦门了。Theyhaveboughtadictionary.(Theyboughtadictionaryandtheyhaveitnow.)他们买了一本字典。注意:现在完成时不能和明确指出时间的状语(如:yesterday,last,year,in1976,twodaysago,justnow,whenshecamein等)连用，但可以和不明确指出时间的状语(如:already,yet,ever,never,sometimes,always,often,before,once,twice,recently,lately等)连用；也可以和表示包括现在在内的时间状语(如：today,thismorning,thisweek,thisyear等)连用。Therearesomedifferencesbetweenthesimplepasttenseandthepresentperfecttense.•Weusethesimplepasttensetotellwhathappenedinthepast.DanielwenttoBeijingtwoyearsago.SimplepasttenseandpresentperfecttenseWeusethepresentperfecttensetotalkaboutanactionthatstartedinthepastandcontinuestothepresent.DanielhaslivedinBeijingfortwoyears.•Weusethesimplepasttensetotellwhathappenedinthepast.Danielboughtanewcomputerlastmonth.Weusethepresentperfecttensetotalkabouttheresultofanaction.Whentheactionhappenedisnotveryimportant.Itmayhavejusthappenedorhappenedsometimeago.Danielhasboughtanewcomputer.(Danielhasanewcomputernow.)MrWuvisitedCanadain2010and2011.•Weusethesimplepasttensetotellwhathappenedinthepast.Weusethepresentperfecttensetotellhowmanytimesanactionhhappenedtillnow.MrWuhasbeentoCanadatwice.Weoftenusethesetimeexpressionswiththepresentperfecttense.alreadyeverjustrecently(not)yetSofaruptonowuntil/tillnowTip2Weoftenusethesetimeexpressionswiththesimplepasttense.yesterdaytheotherdaylast……agoTip1ASimonisshowingMilliesomepictures.Completehissentenceswiththecorrectformsofthewordsinbrackets.Differencesbetweenthetwo1.I________(visit)thePalaceMuseumwithmygrandparentstheotherday.visited2.I_________(climb)MountHuanglastSummer.climbed3.______youever_______(try)thefamousTianjinBaozi?Havetried4.IamhappythatI____________(learn)toswim.havelearntBMrWuisaskingthestudentstomakesentenceswiththecorrecttenses.Helpthemcompletethesentenceswiththecorrectformsofthewordsinbrackets.1.I__________________(finish/just)myhomework.Millie_________(finish)herhomework20minutesago.havejustfinishedfinished4.I_________(live)inSunshineTownsinceIwasborn.Daniel______(live)inNanjingin2007.2.I______(write)anemailtomyfriendyesterday.Daniel__________________(write/already)twoemails.3.I_____(be)inHainanlastmonth.Someofourclassmates_____________(notbe)toHainanyet.wrotehasalreadywrittenwashasnotbeenhavelivedlivedMillie:⑴__________________(you/be/ever)toNanjing?Simon:Yes.I(2)_________(be)therethreetimes.Millie:When(3)___________(you/go)therelast?CMilliehasneverbeentoNanjing.SheisaskingSimonaboutthecity.Completetheirconversationwiththecorrectformsofthewordsinbrackets.HaveyoueverbeenhavebeendidyougoSimon:Lastsummer.I(4)_______(spend)aweekthere.Millie:(5)___________(you/like)it?Simon:Ohyes.I(6)______(have)agreattimethere.I(7)________(visit)manyplacesofinterestand(8)____(eat)lotsoflocalfood.Millie:Luckyyou!I(9)_______________(be/never)there.spentDidyoulikehadvisitedatehaveneverbeenSaturday,15MarchHaveyoueverdreamtoftravellingaroundtheworldwithoutapassport?Yes,youcanrealizeyourdreambytakinganonlinetour.YesterdayDaniel⑴________meanonlineDMillieiswritingabouttheUSAinherdiary.Completeherdiaryentrywiththecorrectformsoftheverbsinthebox.bebuyreadreturnseeshowshowedtouroftheUSA.I(2)_______never______somanywonderfulpicturesbefore.Lastweek,I⑶________abookabouttheplacesofinterestintheUSA.I(4)__________20pagesalready.Itsreallyinteresting.Mydad(5)____just________fromtheUSA,butI(6)______never________there.IhopeIcanvisittheUSAsomeday.haveseenboughthavereadhasreturnedhavebeenI.改写句子。1.Myfathercamebackfromthebookshopjustnow.Myfather______just______________thebookshop.2.HebegantolearnChinesein2001.He____________Chinesesince2001.3.Thefilmbegantwominutesago.Thefilm_________________sincetwominutesago.4.Hehashadthemotorbikefortwoyears.It’stwoyears______he________themotorbike.He________themotorbiketwoyears______.Twoyears____________sincehe______themotorbike.hasreturnedfromhaslearnedhasbeenonsinceboughtboughtagohaspassedbought1.We_______(plant)treeslastSunday.Sofarwe____________(plant)ov