八年级英语下册 Unit 1 Past and Present现在完成时课件

1、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 finishedhas learned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

2、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。这种用法常与already, just, yet, ever, never, befor

3、e(句末)等连用. I _ (do) my homework already.He _(not finished) his homework yet._you ever _(be) to Beijing?We _ never _ (see) such an exciting match before.Mother _ just _(clean) the house. Please dont come in.They _(practice) this dialogue twice.have donehas not finishedHavebeenhaveseenhascleanedhave pr

4、acticed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 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 seen the film already. 用法2：表示动作或状态从过去开始一直延续到现在甚至将来Mi

5、ke borrowed the books two days ago.Mike has kept the books for two days.切记有些动词是非延续的，在此用法中要换成其相对应的延续性动词： buy borrow open close leave die join begin -have - keep -be open -be closed -be away -be dead -be a member of -be on get/come/arrive get up-finish wake-fall ill- become catch a cold -be in be up b

6、e over be awakebe ill behave a cold电影已开始十分钟了.这工厂开业一年了.他参军有3年了。这辆车你买了多久了。Jim离开家乡年了他们到北京有两天了 The film_ _ _ for 10 minutes.The factory has _ _ for one year .He _ _ _ the army since 3 years ago.How long have you_ the car?Jim has _ _ _his hometown for 10 years.He has _ _ in Beijing since _ _ _.标志词：for +一

7、段时间, since+过去的时间点, these years, so far, in the past/last yearsWe _ (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 learnedhas beenhave writtenhas grownha

8、ve/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 tohave been inhave been to BAABB 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 S

9、hanghai for ten years 他去上海了。He has gone to Shanghai.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

10、 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 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

11、 an hour ago.has workedcamehave cookedcooked 写出下列动词的过去分词 1. have _2. see _ 3. eat _4. change _ 5. know _ 6. live _7. turn _ 8. become _ 9. move _ 10. be _ 11. make _12. give _用for, since 填空： We have been friends _ we were seven years old. 2. I have known Daniel _ seven years. 3. We have learned Engl

12、ish _ more than one year. 4. The Green family have lived in this street _ 1995.5. Mr. Wang has taught in this school _ ten years. China has _ the WTO for some years. A. taken part in B. joined C. been a member of D. entered2. When did you _ the new motor-bike? -Well, I _ it for half a month. A. have

13、, have bought B. buy, have had C. buy, have bought D. have, have had3. I _ to Canada twice. Its so beautiful. A. wont go B. have gone C. dont go D. have been4. Where is you father? -He _ to Australia on business. A. has been B. has gone C. went D. will go5. You are leaving you school. How do you lik

14、e it? -Very much, of course, I_ this school since I moved here. A. came to B. have gone to C. have been at D. have been to 用所给动词的适当形式填空： 1. Look! The children _ (plant) flowers in the garden. 2. I _ (know) the place for many years. 3. Where is my pen? How strange! It _ (be) here just a moment ago. 4. He _ (give) the book back to you if he _ (finish) reading it tomorrow. 5. Mr Dong often _ (meet) up with his friends in the new park. 6. How long _ you _ (live) in Nanjing since you were _ (bear)? 7. They only _ (meet) once. But they were _ (like) old friends. 8. Tom