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1、Sifflar iwww.d(usai制作人：肖梅Review：1 Police in America have stepped up their search for a boy who went missing.2. People have shown great interest in his disappearance due to sightings of alien visits.3.1 haven，t seen Justin since 4. Some people in Dover also say that they have seen aliens .5-People ha
2、ve not ruled out the possibility that Justin was taken by aliens 6Peterson , who has taken charge of the case Present perfect tenseSummary:The Present Perfect TenseForm（结构）：have/has + doneFind out some sentences which are in thepresent perfect tense in the text.Mr Zhang has just bought ew car, but h
3、e has had touble with motorists. When he returns hnmp at nioht he always find that someone has parked 艮 car outside his gate. Because of this, he has not been ible to get his own car into this garage even once. He has to walk home after he narks his car. “ whaf s the matter? Have you bought a car?”
4、“ Yes, but” Mr Zhang has put up a 66 No parking sign outside his gate, but it has not any effectExtension 11 The teacher in the black jacket has left 2. We have studied English 3. Kung Weizheng has already finished the homework.4. He has had his lunch 5have seen the film of Titanic twice 6. Most stu
5、dents have made great progress in reading 7. Mr Feng has just returned from Britain .Summary 1：表示过去发生的某一动作对现在造成的影 响或产生的结果现在完成时这一时态强调 是过去动作与现在的联系，也就是强调现在 的影响和结果通常与表示包括现在在内的 时间副词just （刚刚）already （用于肯 定句）before, yet （般疑问：已经；否 定句：还）never, ever等状语连用。brill 11.1 have ftad(have) lunch already.2. Has the tra
6、in arrived (arrive), yet?3-Tome 力日snever_ bee/? fo(be to ) China.4. The twin has just seen (see) my father.5. The twins saw (see) my father just now.Extension 21-Wehave studied(study) English forabout four years.2, We have lived (live) in Houji Middle School since three months ago.3. The old man has
7、 been dead (已经死了) for two years 5. Justin has been missing for two weeks.6.1 haverft seen Guo Yi these days.Summary 2：强调某一动作或状态从过去某一时间开始延续到现在且有可能继续下去用延续动词。通常和for, since, so far, by now, until now, these days, in the last ten years,弓 I 导的时间状语连用。Drill 21. The pricerecently, but I doubtwhether it will
8、remain soA went down, B will go down伽 gone down D was going down2. In the past few years theregreatchanges in Da Miao town.A is B were、滋ve been D will be.Time friends4迄今为止：so far, up till now, up to now, until now.2最近的过去：in the last/past years, recently, lately, these few days.3表示一段时间的短语：all day, al
9、l this year, all ones life瞬间性动词如 arrive, join , die, get, come, buy, sell, leave, borrow, marry 等，以及终 止性动词如start, begin, finish等,在现在完 成时的肯定形式中不能与“for+段时间” 的时间状语连用，但可以用在否定句或这些 动词对应的状态动词中。为了表述这种意思， 我们常用相应的延续性动词have,keep,be等 来代替非延续性动词。常见的短暂性动词:come, go, leave, arrive, reach, begin, start, end, see, hea
10、r,marry, buy, borrow, close, lose,join, die, get up, become, fall, finish,join, get to know 等。和表一段时间的时间状语连用时，必须将 短暂性动词改为延续性动词。短暂性动词与延续性动词的转换（熟记）come -be hereborrowkeepfinish -be overdie-be deadleave/go 一 be away (from) buy have begin be onget to know knowarrive/get to/ come / reach 一 be in/at marry/
11、get married (to) be married (to) fall asleep/get to sleep be asleep join the club be a member of the club(X)N )& )(X)I have bought a new dictionary for a week. I have had a new dictionary for a week-.我买一本新词典已有一星期了。They have been here for two days.They have come here for two days.他们来这儿已经两天了。He has ma
12、rried Amy for two years.He has been married to Amy for two years 他和艾米结婚两年了。The man has left the village for several years. ( X)The man has been away from the village / for several years.这个人离开村子已经几年了。have/has been (to)have/has gone (to)have/has been (to)表示“去过某地”(现在不在那里了，已经回来了)可与once, never, several t
13、imes等连用4. They have been to Beijing twice.2. Where have you been?have/has gone (to)表示“去某地了 ” (说话时某人不在当地，还没回)He has gone to Beijing 常用固定句型1 It is (has been) + 段时间 + since + 从句 (般过去时)翻译：他祖父去世已有两年了。It is two years since his grandfather died.=It has been two years since his grandfather died.His grandfot
14、her has been dead for two years.2) This (That/ It) is the first (second.) time + that +从句(现在完成时)翻译：1 这是他第一次参观这家工厂。2.这是我第二次读这本书。1. It is the &rst time that he has visited this factory.2. This is the second time that I have read the book.3) This 仃hat/lt) is the best/ most interesting/ finest/. + that
15、+从句(现在完成时)1. 这是我看过的最好的电影。It is the best film that I have ever seen.2. 这是我吃过的最好吃的食物。This is the most delicious food that I have ever eatentranslation:不累啊？你已跳了三个小时啦！Aren Jtyou tired ?You have been jumping for three hours.她肯定累了，因为她一天一直在跳舞She must be tired, for she has been dancing all day.The PresentPerfect Continuous TenseForm: have/has + been + doing注意：不用被动语态、表示一个动作从过去某一时间开始一直持续到现在，这动作仍在进行，且还有可能继续下去。1. 自上周星期日以来就一直在下雨。
