初中过去完成时课件.ppt

1、本课重点：本课重点：动词过去分词规则极不规则变化动词过去分词规则极不规则变化过去完成时用法过去完成时用法 有时间状语提示词有时间状语提示词 无时间状语提示词无时间状语提示词过去完成时与现在完成时的区别过去完成时与现在完成时的区别过去完成时与一般过去时的区别过去完成时与一般过去时的区别过去分词的构成：1.规则动词的变化：a)一般情况下在动词后面加 ed work-worked play-playedb)以 e 结尾的动词直接加 d use-used refuse-refusedc)以辅音字母加 y 结尾的动词，把 y 改 i 再加 edstudy-studied carry-carriedd)以

2、重读闭音节结尾的，前面有单个元音字母时，双写辅音字母，再加 edstop-stoppeddrop-dropped2.不规则动词的变化见课本 附录过去完成时的构成过去完成时的构成：由助动词：由助动词had+had+动词的过去分词（动词的过去分词（done)done)构成：助动词构成：助动词had+had+动词的过去动词的过去分词（分词（done)done)用法：用法：1.1.过去完成时动词表示过去某一时间或过去完成时动词表示过去某一时间或某一过去动作之前完成的动作或状态某一过去动作之前完成的动作或状态,即即“过去的过去过去的过去”。下面按照有无时间状语提示词分为两大类讲解下面按照有无时间状语提示

3、词分为两大类讲解:(一一)有时间状语提示类：有时间状语提示类：(1)by+(1)by+过去时间过去时间：e.g.e.g.by the timeby the time(在在时之前时之前),by by the end of the end of(在在结束结束/末之前末之前),by thenby then(截止到那截止到那时时););(2)up to/till(2)up to/till(直到直到)+)+过去时间过去时间：e.g.e.g.up till thenup till then (直到那时直到那时)等。等。1.1.到六点钟为止他们已经工作八小时了。到六点钟为止他们已经工作八小时了。By six

4、 oclock they _(work)By six oclock they _(work)for eight hours.for eight hours.had workedhad worked2.2.到上个月末我们在北京住了有五年时间了。到上个月末我们在北京住了有五年时间了。By the end of By the end of last monthlast month we _ we _(live)in Beijing for five years.(live)in Beijing for five years.had livedhad lived4.4.到那时，他已写完那封信。到那时，

5、他已写完那封信。By the time we got there，he _(leave)already.had lefthad left3.3.当我们到那儿时，他已经离开了。当我们到那儿时，他已经离开了。Up till then，he _(write)that letter.had had writtenwritten（3 3）此外，过去完成时与）此外，过去完成时与when,before,after,as when,before,after,as soon as,soon as,till/untiltill/until 等引导时间状语的从句连用，强等引导时间状语的从句连用，强调动作发生的时间前

6、后。调动作发生的时间前后。1.1.她到家之前她的孩子已经睡着了。她到家之前她的孩子已经睡着了。When she When she got got home home，her children _her children _ (sleep).(sleep).had slepthad slept2.2.在他们到达之前电影已经开始了。在他们到达之前电影已经开始了。Before they Before they arrivedarrived here,the film _ here,the film _ already _(start).already _(start).had had started

7、started3.3.我打完植物大战僵尸就去睡觉了。我打完植物大战僵尸就去睡觉了。I I wentwent to sleep to sleep as soon as I _as soon as I _(play)“plants VS zombies”.(play)“plants VS zombies”.had playedhad played4.4.看了看了暮光之城暮光之城许多次之后，她终于厌烦了。许多次之后，她终于厌烦了。She finally She finally got got bored after she_bored after she_(see)the film“twilight

8、”many times.(see)the film“twilight”many times.had seenhad seen2.2.她怀疑她是否通过了体育测试。她怀疑她是否通过了体育测试。had readhad read1.1.他说他读过这本书。他说他读过这本书。He said that he _(read)He said that he _(read)this book.this book.She wondered if she _ She wondered if she _（passpass）the PE test.the PE test.had had passedpassed(二二)无

9、时间状语提示类无时间状语提示类先于某过去动先于某过去动作作4.4.她不想看她不想看黑天鹅黑天鹅，因为她已经看过了。，因为她已经看过了。She didnt want to see the film She didnt want to see the film“Black Swan”because she“Black Swan”because she _(see)it._(see)it.had seenhad seen3.3.我听说我听说Justin BieberJustin Bieber已经有过两个女朋友了。已经有过两个女朋友了。I heard that Justin Bieber _(have

10、)I heard that Justin Bieber _(have)two girl friends.two girl friends.had hadhad had过去完成时与现在完成时的区别过去完成时与现在完成时的区别过去完成时过去完成时强调在过去某时间或过去某动作之前，即强调在过去某时间或过去某动作之前，即过过去的过去。去的过去。(1)(1)按按时间状语时间状语区分，比较：区分，比较：byby then/yesterday/last month then/yesterday/last month等等过去时间过去时间 +过去完过去完成时成时 byby now+now+现在完成时现在完成时

11、（by now by now=so far=so far）by the end of+by the end of+last month/yearlast month/year等等过去时间过去时间+过过去完成时去完成时 by the end of+by the end of+this month/yearthis month/year等现在时间等现在时间+现现在完成时在完成时（*注：注：by the end of this month/yearby the end of this month/year还可能跟将来完成时）还可能跟将来完成时）up to/tillup to/till thenthe

12、n +过去完成时过去完成时 up to/till up to/till nownow +现在完成时现在完成时by the time+by the time+人称人称+did +did +过去完成时过去完成时 by the time+by the time+人称人称+do+do+现在完成时现在完成时So far,I _(collect)100 stamps.By the end last year,the factory _(produce)100,000 shoes.Tom _(learn)English for 4 years since 2007.Mom _(in)the kitchen

13、by the time I finished my homework.Sakura _(study)in this school for about 9 years up till now.He _(away)from his hometown up to then.The dog _(die)for 3 weeks and Mary still feels sad.(2)(2)按是否按是否体现某动作在另一过去动作体现某动作在另一过去动作之前之前发生区分：发生区分：有标志词：有标志词：when,before,after,as soon as,when,before,after,as soon

14、as,till/untiltill/until等等When she When she got got homehome，her children her children had slepthad slept.Before they Before they arrivedarrived here,the film here,the film hadhad already already startedstarted.He He saidsaid that he that he had methad met you.you.She She wonderedwondered if she if s

15、he had passedhad passed the PE test.the PE test.无标志词：无标志词：宾语从句等宾语从句等1.Jake _(be)Beijing for 3 month before he came back.2.I went home as soon as the sun _(go)down.3.Jim bought a set of combs for his wife after he_(sell)his watch chain.4.I didnt go to bed until the program _(finish).5.Mom asked if I

16、_(have)breakfast this morning.6.I didnt expect that because I _(prepare)for such a surprise.7.You would have lost the game if he _(help)you.8.I went to Toms house but he _(go)out.过去完成时与一般过去时的区别过去完成时与一般过去时的区别一般过去时常见标志词：一般过去时常见标志词：比较：He had been a student for 8 years by the time he was sixteen.He was

17、a student 8 years ago.They had packed all their things before they went to the airport.They packed all their things yesterday.He _(lend)$100 a month ago.Sally _(buy)an ipod touch the day before yesterday.Joe _(run)3 loops before he took a rest.Mini _(practice)piano last month.She told me she _(acqui

18、re)all the skills.When _ you _(go)for a picnic?1.After he _(finish)his work he went out.had finished2.The children ran away after they _(break)the window.had broken3.By end of last month,the factory _(produce)2,000,000 pair of shoes.had produced4.Annie told me that his father _(go)to Paris and he _(come)back in a few days.had gonewould come5.My friend _(buy)the car two years ago.He _(buy)it for two years.boughthas had