一般过去式与现在完成时的区别.pptx

pastsimplepresentperfect

Contents1.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

010203asingularpastevent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.2

3ReasonswhenandwhyforPresentPerfect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ReasonswhenandwhyforPresentPerfect

comparePastSimplewithPresentPerfect2RemeberRemember1PresentPerfectcanbeusedwhenthetimeperiodhasnotfinishedIhavelivedinBeijingfortwoyears.PastSimplecanbeusedwhenthetimeperiodhasfinishedIlivedinBeijingtwoyearsago.

comparePastSimplewithPresentPerfect2RemeberRemember2PresentPerfectisoftenusedwhengivingrecentnewsMyfriendhasjionedtheswimmingclub.PastSimplecanbeusedwhengivingolderinformationMyfriendjionedtheswimmingclublastweek.

comparePastSimplewithPresentPerfect2RemeberRemember3PresentPerfectisusedwhentimeisnotspecificIhavefinishedmyhome