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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,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 terrible 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 up,went missing,has received great interest,hasnt seen,took,havent been sleeping,havent dismissed,are looking into,find out,find out step up,1,Present perfect tense&,Present prefect continuous tense,Grammar,Present perfect tense&Grammar,2,1.The form of the present,perfect tense:,have(has)+过去分词,1.The form of the present,3,Justin,has disappeared,so Kelly is very sad.,I cant enter my house because I,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:,Justin has disappeared,so Kel,4,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 have not seen Justin since l,5,I,havent seen,you,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.,I havent seen you for ages.No,6,Note 4,:,We use it with time expressions such as:,for,since,already,yet,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,yet ：否定句或疑问句,for,+一段时间,since,+过去的一个时间点,句子（一般过去时）,Note 4:We use it with time ex,7,Note 5:,to talk about actions that were,completed only a short time ago.,He,has,just,gone,out.(=He went out a few minutes ago.),I,have,just,heard,the news.(=Now I know the news.),Note 5:to talk about actions,8,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 times,They say that they,have been,to America,many times,.,Note 6:We can also use the pr,9,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.,现在完成时和一般过去时？Tom,10,Tom,rang up,three times this morning.,Now it is,not,still in the morning.,Tom rang up three times this m,11,Note,The present perfect tense used,for a past action whose time is not definite and often has a result in the present.,e.g.Tom,has had,a bad car crash.,Hes probably still in hospital now.,NoteThe present perfect tense,12,Tom,had,a bad car crash.,He is probably out of,hospital now.,Tom had a bad car crash.He is,13,I,saw,this film yesterday.,（强调看的,动作发生在过去,某个时间）,I,have seen,this film.,（,强调对现在的影响,，即电影的内容已经知道了）,I saw this film yesterday.,14,1 _ you _ my pen?Yes,I_,it 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 putting,Have,Have,had,seen,had,saw,1 _ you _ my pen?Y,15,一般过去时与现在完成时的区别,1.一般过去时,表示过去某个时间发生的动作，,可与具体的过去时间,状语连用，如yesterday，last night等。,现在完成时,强调,对现在的影响,，,不与具体过去时间状语连用,，但可与ever,never,before,just,already 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 postman_,this morning,?(come),finished,have,finished,Has,come,Did,come,一般过去时与现在完成时的区别1.一般过去时表示过去某个时间发,16,Note：,for+,一段时间一件事发生过几次，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.I _(read)the novel twice,already,.,Conclusion,: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.,has been,was,read,have read,Note：for+一段时间一件事发生过几次，不一定都用现在,17,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：,It is the first time that I_ the city.(visit),This is the first time I_ him sing.(hear),have visited,have heard,用于现在完成时的句型1.This/That/It is t,18,2.This/That/It,is,+形容词最高级+(that),在这种结构中，that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 seen,have experienced,2.This/That/It is+形容词最高级+(,19,3.It is(has been)+一段时间+since+一般过去时,It,has been,over 2 months since I _(come)to this school.,(formal English),It,is,over 2 months since I_(come)to this school.,(spoken English),came,came,3.It is(has been)+一段时间+sin,20,4.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 _it,with 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去。（强调“做完”）,NOTE:,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。,如：If it _(rain)t
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