一般过去式与现在完成时的区别

pastsimplepresentperfectContents1.DefinitionofPastSimpleandPresentPerfecttense意义4.Exercises练习2.ComparePastSimplewithPresentPerfecttense对比3.Signalwords标志词HavealookIstudiedEnglish.IhavestudiedEnglish.1DefinitionofPastSimpletense过去某个时间发生的动作或存在的状态pastsimple=whenwetalkaboutanactionthathappenedinadefinitetime,theactionhasebeenfinishedorcompleted.IwalkedonthebeachinThailand.IwenttoThailandlastweek.ReasonswhenandwhyforPastSimple在以下场景中asingularpastevent单纯过去事件aseriesofconsecutivepastevents连续的过去动作ReasonswhenandwhyforPastSimplesthwastrueforsometimeinthepast过去的事实1DefinitionofPresentperfecttense1、表示动作到现在为止已经完成或刚刚完成；2、表示过去发生的动作或事情对现在的影响和产生的结果;它强调的是过去的动作同现在的联系。presentperfect=whenwetalkaboutsththathappenedinthepastbutrelatedtothepresent表示过去发生的动作、状态或者习惯，到今天仍能成立。NowAlongtimeago,IbecameSantaClaus.FutureIhavebeenSantaClausforalongtime.IamstillSanta.BeforeNo.1表示过去发生的某一动作对现在造成的影响或结果。No.2NowBeforeIthassnowedheavilythisweek.FutureTheheavysnowhasbrokenmysleigh.brokenNo.23ReasonswhenandwhyforPresentPerfect在以下场景中acontinuingactionthatstartedinthepast过去发生延续到现在experences经历changesoveraperiodoftime随时间推移产生的变化complishments成就ReasonswhenandwhyforPresentPerfectcomparePastSimplewithPresentPerfect2RemeberPresentPerfectcanbeusedwhenthetimeperiodhasnotfinishedIhavelivedinBeijingfortwoyears.PastSimplecanbeusedwhenthetimeperiodhasfinishedIlivedinBeijingtwoyearsago.comparePastSimplewithPresentPerfect2RemeberPresentPerfectisoftenusedwhengivingrecentnewsMyfriendhasjionedtheswimmingclub.PastSimplecanbeusedwhengivingolderinformationMyfriendjionedtheswimmingclublastweek.comparePastSimplewithPresentPerfect2RemeberPresentPerfectisusedwhentimeisnotspecificIhavefinishedmyhomework.PastSimpleisusedwhenthetimeisclearIfinishedmyhomeworkyesterday.Signalwords3Remeber现在完成时和一般过去时的用法比较PastSimplePresentPerfectyesterdaylast......agoin+过去的时间justalreadysofaruptonowneveryetsincefor...PresentPastTense一般过去时PresentPerfectTense现在完成时4Exercises现在完成时&一般过去时区别We______________eachothersincewewerenineorten.We_______eachothertenyearsago.Examples(know)haveknownknewPresentPastTense一般过去时PresentPerfectTense现在完成时Exercises现在完成时&一般过去时区别I_____just_____himtwice.I________himthismorning.Examples(see)havesawseenPresentPastTense一般过去时PresentPerfectTense现在完成时现在完成时&一般过去时区别Have--______you_________yourbike?--Yes,I_______.--When_______you_______it?--I__________ityesterday.Examples(repair)repairedhavedidrepairrepaired