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1、,past simple,present perfect,Contents,1.Definition of Past Simple and Present Perfect tense 意义,4. Exercises 练习,2. Compare Past Simple with Present Perfect tense 对比,3.Signal words 标志词,Have a look,I studied English.I have studied English.,1,Definition of Past Simple tense,过去某个时间发生的动作或存在的状态,past simple
2、=when we talk about an action that happened in a definite time, the action hase been finished or completed.,I walked on the beach in Thailand.,I went to Thailand last week.,Reasons when and why for Past Simple在以下场景中,a singular past event单纯过去事件,a series of consecutive past events连续的过去动作,Reasons when
3、and why for Past Simple,sth was true for some time in the past 过去的事实,1,Definition of Present perfect tense,1、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。,present perfect=when we talk about sth that happened in the past but related to the present,表示过去发生的动作、状态或者习惯，到今天仍能成立。,Now,A lon
4、g time ago, I became Santa Claus.,Future,I have been Santa Claus for a long time.,I am still Santa.,Before,No.1,表示过去发生的某一动作对现在造成的影响或结果。,No.2,Now,Before,It has snowed heavily this week.,Future,The heavy snow has broken my sleigh.,broken,No.2,3,Reasons when and why for Present Perfect在以下场景中,a continui
5、ng action that started in the past 过去发生延续到现在,experences经历,changes over a period of time 随时间推移产生的变化,complishments成就,Reasons when and why for Present Perfect,compare Past Simple with Present Perfect,2,Remeber,Remember 1,Present Perfect can be used when the time period has not finished,I have lived in
6、Beijing for two years.,Past Simple can be used when the time period has finished,I lived in Beijing two years ago.,compare Past Simple with Present Perfect,2,Remeber,Remember 2,Present Perfect is often used when giving recent news,My friend has jioned the swimming club.,Past Simple can be used when
7、giving older information,My friend jioned the swimming club last week.,compare Past Simple with Present Perfect,2,Remeber,Remember 3,Present Perfect is used when time is not specific,I have finished my homework.,Past Simple is used when the time is clear,I finished my homework yesterday.,Signal word
8、s,3,Remeber,PresentPast Tense一般过去时,Present Perfect Tense现在完成时,4,Exercises 现在完成时& 一般过去时区别,We _each other since we were nine or ten .,We _each other ten years ago .,Examples (know),have known,knew,PresentPast Tense一般过去时,Present Perfect Tense现在完成时,Exercises 现在完成时& 一般过去时区别,I _ just _ him twice.,I _ him this morning .,Examples (see),have,saw,seen,PresentPast Tense一般过去时,Present Perfect Tense现在完成时,现在完成时& 一般过去时区别,Have,-_ you _your bike? -Yes, I _. -When_ you _ it? -I _ it yesterday.,Examples (repair),repaired,have,did,repair,repaired,
