八年级下学期Unit1课件.ppt

,Present perfect tense,现在完成时态,一、现在完成时谓语动词的构成： 助动词have/has(not) +V-ed（过去分词）,I _(finish) the composition already.,He _(learn) English for three years.,We/You/ They.,She.,have finished,has learned,过去分词的构成,规则形式 - ed 不规则形式 repair-repaired - e +d (见表格121) like /live/ move/love 双写辅音+ed stop/mop/travel,现在完成时态的含义是表示过去发生的或已完成的动作对现在造成的影响或结果。特点是既涉及过去，又联系现在：动作是过去发生的，结果是现在存在的。,She has gone. (她走了。) 从这句话中动词所用的现在完成时态可以看出“走”的动作是过去发生的，而对现在所造成的结果是她不在这里了。,He speaks French so fluently. He learned it in Paris. He was there for two years. He has studied French. (他学过法语。) 这句话所说明的结果是他现在懂法语。,Look! The blackboard is so clean now. He has cleaned the blackboard. (他已经擦过黑板了。) 这句话所表示的结果是黑板现在是干净的。,现在完成时用法（一）,过去的(结束性)动作产生的影响或结果现在还存在。,常用短暂性动词做谓语动词.如arrive, get, finish, borrow, open, stop, begin, go, come, die, fall, 时间状语常用already, just, yet, ever, before, once( 一次),recently 等 不具体的过去时间 或不带有时间状语,I _ (do) my homework already. He _(not finished) his homework yet. _you ever _ (be) to Haiwaii? We _ never _ (see) such an exciting match before. Mother _ just _(clean) the house. Please dont come in. They _(practice) this dialogue twice.,have done,has not finished,Have,been,have,seen,has,cleaned,have practiced,I _( not hear) from her yet. _they _(be) here recently? Yes, they have. I _(be) busy recently. -_your father ever _ (travel) to New York? -No,never. He _(not travel) by plane yet.,havent heard,Have been,have been,Has travelled,hasnt travelled,注意：当在肯定陈述句中含有already或just 时，在转换成否定句或疑问句时，要把句中的already 或just 去掉，在句末加上yet.,I havent seen the film named King Lion yet., I have done my homework already.,I havent done my homework yet., Mother has just cleaned the house.,Mother hasnt cleaned the house yet., I have already seen the film named King Lion.,For . Since,How long have/has sb .? lived learned owned,The door has been open for a whole day. The windows have been closed since 7:30 I have had this bike for a year/since last year. My teachers have been busy/ free these days.,现在完成时用法二:,过去开始的动作或状态一直持续到现在 1. 常用延续性动词,如be, sleep, live, learn, stay, have, keep, work, walk, 2. 时间状语须表达过去到现在的一段时间. for two years so far since 短语, during the past 2 years since 从句 in the past 2 years,表示一段时间的主要结构,2000 last week yesterday (evening) three weeks ago he joined the Party two years ago,1. for two weeks /years /hours/,2. since,since过去某一点时间 或过去某一结束性动词,标志词：for +一段时间, since+过去的时间点, these years, so far, in the past/last years,We _ (learn) English for three years/ since two years ago/since 2000. Mr. Green _ (be) in China these years. They _(write) 15 songs so far. The population _ (grow) more slowly in the past ten years.,have learned,has been,have written,has grown,1.The Jiangs _(live) here for almost ten years. 2.He _(work) in the factory since 1994. 3.His parent _(teach) in this school since they came to the city. 4.The child _(sleep)since two hours ago.,have lived,has worked,has taught,has slept,Work in pairs:,Doctor: Whats wrong with you,young man? Man: Maybe I _(catch) a cold. D : How long _ you _(be) like this? M : _ yesterday morning. D : _ you _(take) the temperature yet? M : No, _ yet. D :.Oh,you have had a little fever. _you_(take)any medicine yet? M : I _(take) some aspirin this morning. D : How many pills _you ever_(take) so far? M : About four pills. D : Ok. Its nothing serious. Dont worry. You have to stay in bed for a few hours drink plenty of water. Youll be better tomorrow.,have caught,have been,Since,Have taken,not,Have taken,took,have taken,Work in pairs: P17,I must say (that) sb/sth is the best/ I have seen. . most.,Work in pairs: A: What places in China have you visited? B:. A:Have you ever travelled .by? B: A: By the way, when did you go to.? B: .I must say that its the most beautiful/interesting place I have,现在完成时和一般过去时的区别：,现在完成时，强调这一动作产生的结果对现在的影响，与现在有关。 一般过去时，仅仅表示在过去某一时刻曾发生过这一动作，与现在无关。,他已学英语五年了。,He has studied English for five years.,他曾学过五年英语。,He studied English for five years.,（说明他还继续学下去）,（只说明他过去学过五年英语，但现在不学了。）,一般过去时与现在完成时有一些明显的时间状语。,遇到yesterday, Last year, in May, in+过去某一年，two days ago, the other day, just now等就用一般过去时,当有 just,already,yet,so far, in the past/ last few days(在过去/最近的几年里)，since接过去时间状语或过去时的句子等常用现在完成时,现在完成时和一般过去时,He _(work) in our school for one year. He _(come) to our school last year/in 2002. They _(cook) the supper already. They _ (cook) the supper half an hour ago. He _just _(pass) the exam. He _(pass) the exam just now.,has worked,came,have cooked,cooked,has passed,passed,1.-_the film _(开始)? -Yes, it _ (开始)ten minutes ago. 2.I _(读) this book. I _ (读)it last Sunday. 3._you _ (完成) yourhomework? Yes. When_ you _(完成)it? A minute ago. 4. I wont see the film. I _ it(看了) . I _ (看)it last week. 5.-I _ (找到)a watch already. -Where _ you _it? -In the playground.,Class is over.,Class began five minutes ago,Class has been on for five minutes.,短暂性动词转换为延续性动词,1.buy -have(我买电脑两年了.) 2.borrow -keep(他借这本书三个星期.) 3.begin to sleep/study/去掉begin to ( 他已睡了半个小时了.) 4.move into -live in(他已搬进来三个月了.) 5.leave home -be away from home (我已离家一年.) 6.fall ill-be ill(Helen病了一周了),7.join the group-be in the group be a member of (我们加入电脑兴趣小组已有两年了.) 8. die-be dead (我爷爷死了两个月了) 9.get up- be up (他已起床一刻钟了.) 10.begin- be on (会议已开始十分钟.) 11. come to / arrive in /get to -be in (他已到南京三天了.) 12. open /close- be open/be closed (门开/关了十分钟了),1. turn on the radio-keep the radio on He turned on the radio an hour ago. He _ _ the radio _ for an hour. The radio _ _ _ for an hour. 2. open the door-keep the door open I opened the door twenty minutes ago. I _ _ the door _ for 20 minutes. The door _ _ _ for 20 minutes.,has kept on,has been on,have kept open,has been open,have/has gone to have/has been in have/has been to,1.A: Wheres Jim, Li Lei? B: He _his school library. 2.The Greens _China for three years. We _the Great Wall twice. Its very beautiful.,has gone to,have been in,have been to,B,A,A,B,B stay,A,她以前曾去过上海。,She has been to Shanghai before.,他在上海10年了。,She has been in Shanghai for ten years,他去上海了