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1、 find out step up not dismiss look into take not sleep go missing receive great interest not see Police _ their search since Justin_ 3 days ago.Up to now,this incident _due to the reports of alien visit.Justins sister_ him since and she is sure the aliens _him that night.Mrs Mavis Wood shared her te
2、rrible experience I _well since I returned home.she said.The police _ the idea that Justin was taken by aliens,but there is no hard evidence for it.They _other possibilities as well.They will not give up until they _what happened.have stepped upwent missinghas received great interesthasnt seen took
3、havent been sleepinghavent dismissedare looking intofind out Present perfect tense&Present perfect tense&Present prefect continuous tense Present prefect continuous tense 1.The form of the present perfect tense:have(has)+过去分词Justin has disappeared,so Kelly is very sad.I cant enter my house because I
4、 have lost my key.Note 1:to talk about things that happened in the recent past,but are connected to the present.2.The uses of the present perfect tense:I have not seen Justin since last Friday night.Note 2:to talk about something that started in the past and is still happening now.I havent seen you
5、for ages.He has just gone out.It has been very cold lately.She has already finished her homework.He hasnt seen her since the meeting.Note 3:We use the present perfect tense when the exact time of an action is not clear or important.Note 4:We use it with time expressions such as:for,since,already,yet
6、,just,never,before,latelyrecently,up to now,by now,so far,in recent years,duringinover the past(last)few years(months)already：肯定句肯定句 yet ：否定句或疑问句否定句或疑问句 for+一段时间一段时间 since+过去的一个时间点过去的一个时间点 句子（一般过去时）句子（一般过去时）Note 5:to talk about actions that were completed only a short time ago.He has just gone out.(
7、=He went out a few minutes ago.)I have just heard the news.(=Now I know the news.)Note 6:We can also use the present perfect tense for repeated actions,that is,we use the present perfect tense with the time expressions once/twice/three timesThey say that they have been to Americamany times.现在完成时和一般过
8、去时？现在完成时和一般过去时？Look at the sentences and find the difference:Tom has rung up three times this morning.Now it is still in the morning.Tom rang up three times this morning.Now it is not still in the morning.NoteThe present perfect tense used for a past action whose time is not definite and often has a
9、 result in the present.e.g.Tom has had a bad car crash.Hes probably still in hospital now.Tom had a bad car crash.He is probably out of hospital now.I saw this film yesterday.（强调看的（强调看的动作发生在过去动作发生在过去某个时间）某个时间）I have seen this film.（强调对现在的影响强调对现在的影响，即电影的内容已经知道了），即电影的内容已经知道了）1 _ you _ my pen?Yes,I_ it
10、 on your desk just now.(see)2 _ you _ dinner?Yes,I _ it with Mary.(have)3.-Where _the MP3 player?I cant find it any where.-I _ it right here,but now its gone.A.did you put;have put B.have you put;put C.had you put;have put D.were you puttingHaveHavehadseenhadsaw一般过去时与现在完成时的区别一般过去时与现在完成时的区别1.一般过去时一般过
11、去时表示过去某个时间发生的动作，表示过去某个时间发生的动作，可可与具体的过去时间与具体的过去时间状语连用，如状语连用，如yesterday，last night等。等。现在完成时现在完成时强调强调对现在的影响对现在的影响，不与具体过去时不与具体过去时间状语连用间状语连用，但可与，但可与ever,never,before,just,already 连用。连用。1.I _my homework an hour ago.(finish)2.I _ already _ my homework.(finish)3._the postman_ yet this morning?(come)4._ the
12、postman_ this morning?(come)finishedhave finished Has come Did comeNote：for+一段时间一段时间一件事发生过几次，不一定都用现一件事发生过几次，不一定都用现在完成时。如果说的是过去的一件事情，则用一般过去在完成时。如果说的是过去的一件事情，则用一般过去时。时。1.My father _a worker for 10 years so far.(be)2.He _ once in the army for 3 years.(be)3.When I was a child,I _(read)the novel twice.4.
13、I _(read)the novel twice already.Conclusion:过去的一件事情持续多长时间过去的一件事情持续多长时间或发生多少次，用一般过去时或发生多少次，用一般过去时.has beenwasreadhave read用于现在完成时的句型用于现在完成时的句型1.This/That/It is the first/second time(that)在这个结构中的从句部分，用现在完成时。如：在这个结构中的从句部分，用现在完成时。如：It is the first time that I_ the city.(visit)This is the first time I_ h
14、im sing.(hear)have visitedhave heard2.This/That/It is+形容词最高级形容词最高级+(that)在这种结构中，在这种结构中，that从句要用现在完成时。如：从句要用现在完成时。如：This is the best film that I_.(see)It is the most enjoyable visit that I _ .(experience)have seenhave experienced3.It is(has been)+一段时间一段时间+since+一般过去时一般过去时It has been over 2 months sin
15、ce I _(come)to this school.(formal English)It is over 2 months since I_(come)to this school.(spoken English)camecame4.在条件、时间、让步状语从句中，表示将来某时间以前已经完成的动作，用现在完成时。I will not believe you unless I _itwith my own eyes.(see)除非我亲眼看到，否则我不会相信你的。(强调“看完”)I will go with you as soon as I_ my work.(finish)我做完了工作就和你一起
16、去。（强调“做完”）NOTE:在状语从句中，用一般现在时表将来；在状语从句中，用一般现在时表将来；用现在完成时表将来完成时。用现在完成时表将来完成时。如：If it _(rain)tomorrow,I will stay at home.(状语从句中，用一般现在时表将来)have seenhave finishedrainsPresent perfect continuous tense1.The form of the Present perfect continuous tense：have(has)+been+doingLook at the sentences:Sorry.Have y
17、ou been waiting long?I have been waiting for an hour.PastOne hour agoPresentwaitingarrive2.The uses of the present perfect continuous tense:To talk about actions that started in the past and are still continuing,or have just finished but are still connected to the present in some way.We have been pr
18、eparing for the coming sports meeting these days.Jiangnan Style has been receiving great interest among the young.现在完成进行时的基本用法现在完成进行时的基本用法 具备完成时和进行时的一些因素，如：它具备进具备完成时和进行时的一些因素，如：它具备进行时的行时的“未完成、暂时性、感情色彩未完成、暂时性、感情色彩”。1)在强调指出动作还未结束在强调指出动作还未结束,还要继续下去。如还要继续下去。如:Ive been reading this book for two hours.（未完
19、成（未完成）2)强调动作延续时间的长久或带感情色彩。强调动作延续时间的长久或带感情色彩。It has been raining for 3 days.(强调说话者“抱怨”的感情色彩)Present perfect or present perfect continuous tense?She is still reading the book.Li Jia has been reading a book about Stonehenge.Li Jia has read a book about Stonehenge.She finished reading the book.She knows
20、 the content of the book now.Note:We use the present perfect tense to talk about an action completed in the recent past,and the present prefect continuous tense for an action that started in the past and is still happening现在完成时现在完成时强调动作的完成。强调动作的完成。现在完成进行时现在完成进行时则强调动作则强调动作一直一直进行现在进行现在,还还很有可能会继续进行下。很有
21、可能会继续进行下。I have visited Egypt twice this month.I have been touring Egypt for two months.Practice1.Im sorry,but I dont quite follow 2.you.Did you say you want to 3.return on September 20?Sorry,I _ myself clear.We want to return on October 20.(2010 北京北京)A.hadnt made B.wouldnt make C.dont make D.havent
22、 made2.Every year a flood of farmers arrive in Shenzhen for the money-making jobs they _ before leaving their hometowns.(2010 福建福建)A.promised B.were promised C.have promised D.have been promised3.Mother wanted to be a good provider,a role she _ since her marriage to Father.(2010 江西江西)A.shoulders B.s
23、houldered C.is shouldering D.has been shouldering4.The book has been translated into thirty language since it _ on the market in 1973.(2010 重庆重庆)A.had come B.has come C.came D.comes5.Im tired out.I _ all the afternoon and I dont seem to have finished anything.(2010 湖南湖南)A.shopped B.have shoppedC.had
24、 shopped D.have been shopping6.I have got a headache.No wonder.You _ in front of that computer too long.A.work B.are working C.have been working D.worked点拨点拨 由语境可以看出由语境可以看出work动作开始于动作开始于过去，持续到现在，对现在还有影响，且过去，持续到现在，对现在还有影响，且含有责备的口吻，所以用现在完成进行时。含有责备的口吻，所以用现在完成进行时。7.-_ you _ him around the museum yet?-Ye
25、s.We _a great time there.A.Have；shown；had B.Do；show；had C.Have；shown；have had D.Did；show；have had 8.Is this the first time that you _here?A.visit B.are visiting C.had visited D.have visited 9.Dont get off the bus until it _.A.is stopping B.has stopped C.will stop D.has been stopping10.-Im sure Tom w
26、ill win the first prize in the final.-I cant agree more.He _for it for months.A.is preparing B.was preparing C.had been preparing D.has been preparing 11.-Look!Someone_ the sofa.-Well,it wasnt me.I didnt do it.A.is cleaning B.was cleaning C.has cleaned D.had cleaned12.a.He _football regularly for ma
27、ny years when he was young.b.He _football regularly for many years since he was young.A.was playing B.played C.has played D.had played13.-Have you been to the USA?-Yes,only once.I _ there only for 7 days.A.have stayed B.was staying C.stayed D.had stayedBC14.-Have you visited the Great Wall?-Yes,when I was in Beijing I _it twice.A.have visited B.was visiting C.visited D.had visited15.Until we have discussed all the details,no decision_ about any new operations.A.will be made B.is made C.is being made D.has been madeHomework 1.Finish Part C1 and C2 on page 88 in Workbook.2.Review Task part.