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1、精选优质文档-倾情为你奉上现在完成时Form:have/has +done(过去分词)Uses：1.发生在过去但对现在有影响的动作。eg.Her last has been a great success.2.过去单独发生的或者反复发生的动作，常和often,sometimes等时间状语连用，不知道或者对动作发生的确切的时间不感兴趣eg:Ive walked across the jungle.3.发生在过去，持续到现在的动作，常和always,since,for,all my life等时间状语连用.通常用于延续性动词。for+时间段. since+时间点和how long连用,但since
2、连接的从句中常用短暂性动作的一般过去时.eg: It has been 5 years since he joined the army.by+时间点. so far. up to now. all day. in the past few years等.eg: He has worked here for 2 years.4.表示过去已经完成的动作，强调其造成的结果，影响. 通常与非延续性动词连用，如状语already, yet, just, ever, never.eg: Ive already finished my homework.拓展延伸:1.延续性动词表示可以持续的行为过程或状态
3、，常见的有stay. have. keep.know. eg:The temperature has stayed high this week.2.非延续性动词表示行为或过程是瞬间完成的，常见的有arrive, buy, borrow, learn, put on, marry, leave,come go, leave,become,join,get up.eg: She has been away for an hour.特殊uses:1.用在时间或条件状语从句中,表示将来做某事之前先要完成的动作,强调从句的动作完成在主句的动作之前.eg: When everyone has taken
4、 his seat, the film will begin.所有人就座后，电影就开始了。I cant give my opinion until I have read the novel through.等我看完这本小说了才能提意见.2.现在完成时在It be the first time+(that)这样的句型中：如果主句的动词表示的是将来时间或现在时间，that分句中的动词用现在完成时eg: It will be the first time Ive spoken in public.这是我第一次在公众面前讲话。如果主句动词表示的是过去的时间，从句动词通常用过去完成时。eg: It w
5、as the first time he had been scolded by his father.这是他第一次被父亲责备。注意：该句型中的time一词可以用week，year，day或其他名词来替换。3.have been to常用来表示到过某地，暗示过去的经历使得主语对那个地方有所了解，而现在已经不在该地，或者表示去过某地或去干某事，说话时此人可能不在那里，已经回来了，侧重经历。eg: Have you ever been to West Hill Farm?(暗含是否对那个地方了解)He has been to Beijing.他去过北京(现在不在北京，已经回来，强调经历)4.hav
6、e gone to表示已经出发去了（某地）有此刻已经在去某地途中或已经到达某地之意，暗示过去发生的go的动作造成现在不在说话的现场的结果，即表示已经去了某地或去干某事了，说话时此人已不在这里，很可能到达那里，也可能在路上。eg: Hes gone to England with hia family.他与家人去英格兰了。(现在不在此地)He has gone to Beijing.他到北京去了(他可能去了北京，也可能在去北京的路上)5.现在完成时和过去时虽都表示过去的动作，但现在完成时表示过去发生的某一动作对现在造成的影响和结果，强调的是与现在的关系，不能与in 1949或just now 等
7、明确的过去时间状语连用，而一般过去时只表示过去发生的动作或状态，和现在不发生关系，它可以和表示过去的时间状语连用。eg：Have you ever been to West Hill Farm?你去过西山农场吗？(强调对现在的影响，暗含是否对那个地方了解)Have you ever been to America?I went there last year.现在完成时的结构肯定句：主语 +have/has + 过去分词eg：I have crossed some sort of line.否定句：主语 +have/has not + 过去分词 eg：I have not crossed so
8、me sort of line.与一般过去时的区别一般过去时：有表示过去时间点的提示词eg：Starbucks(星巴克) _ as a small coffee shop in a market in Seattle in 1971. A.start B.started C.has started D.had started本题中有明显的时间状语in 1971，所以用过去时，做题需要看清题目时间范畴。现在完成时：有already,yet,sometimes,always,often,before,lately,recently,once,twice,ever,never等提示词Eg:-Have
9、 you ever been to New york city?-Yes,I _ there twice.Its a modern city.A.was B.will go C.have been D.had been如何判断现在完成时1.找标志词already, yet, just, before, so far, in the past few years, since+时间点, for+时间段Eg:-Am I late?-Dont worry.Your favourite broadcast _ yet.A.doesnt started B.didnt started C.wont st
10、art D.hasnt started2.联系上下文语境，看过去的事情是否对现在造成影响 Eg：Our monitor _ to bring the key,so we cant enter the classroom right now.A.forgets B.forgot C.has forgot D.had forgot3.现在完成时用来表示从过去一直持续到现在的动作或状态Eg:Mary _ in met housing estate since she came back to Shanghai in 2005.A.is living B.had lived C.would lived
11、 D.has lived如何识别现在完成时1.现在完成时用来表示从过去一直持续到现在的动作或状态。Eg:Mary D in mat housing estate since she came back to Shanghai in 2005.A.is living B.had lived C.would lived D.has lived2.现在完成时不仅表示动作在说话之前已经完成，并且强调对现在的影响和联系，动作本身对现在造成一定影响，也就是说动作发生在过去或状态发生在过去，但他的影响现在还存在。Eg:Our monitor C to bring the key,so we cant ent
12、er the classroom right now.A.forgets B.forgot C.has forgot D.had forgot班长忘记带钥匙（动作），所以我们进不去教室（影响）。Micheal has been ill.(含义:现在仍然很虚弱)He has returned from abroad.(含义是:现在已在此地)总结1.在完成时态中，当句中出现一段时间的状语(since/for)时，句中谓语动词不能用终止性动词。2.现在完成时有完成用法和未完成用法，要注意区分(1)完成用法:表示过去发生的某一动作对现在造成的影响。要充分理解其与过去的动作有关，但强调的是对现在的影响或
13、结果，表明了与现在的关系。(2)未完成用法:表示过去已经开始，持续到现在的动作或状态。在这一用法中，动词描述的动作必须是具有可延续性的，即延续(持续)性动词或状态动词。Up to now, Jack has worked in Beijing for 2 years.到目前为止，杰克在北京工作3. 要注意区分现在完成时和过去时：现在完成时不能和表示过去的时间状语连用，如yesterday, last year, in 1978, tow days ago, just now, when I came in,但可以和already, yet, sometimes, always, often, before, lately, often, recently, once, twice, ever, never等连用。练习Where are you going for your holiday?-well,we _ yet.A.havent decided B.hadnt decided C.dont decided D.didnt decided-Jim isnt in the classroom.Where is he?-He _ to the techers office.A.will B.has gone C.had gone D.is going专心-专注-专业