英语时态结构介绍优秀PPT.ppt

英语时态结构11/24一般现在时一般现在时主语主语+is/am/are+n./adj主语主语+do/does+宾语宾语一般将来时一般将来时:will/shall+do is/am/are going to do/be to do/be about to do 过去将来时过去将来时:could/would do 现在完成时现在完成时:have/has done 过去完成时过去完成时:had done 将来完成时将来完成时:shall/will have done 过去将来完成时过去将来完成时:would/could have done 现在进行时现在进行时:Is/am/are doing 过去进行时过去进行时:was/were doing 将来进行时将来进行时:will/shall be doing 过去将来进行时过去将来进行时:would/could be doing 现在完成进行时现在完成进行时:have/has been doing 过去完成进行时过去完成进行时:had been doing 将来完成进行时将来完成进行时:shall have been doing 过去将来完成进行时过去将来完成进行时:would have been doing完成时perfect tense 现在完成时现在完成时现在完成时的用法现在完成时的用法 主语主语+have(has)+过去分词过去分词(done)（1.）定义：现在完成时用来表示现在之前已发生）定义：现在完成时用来表示现在之前已发生过或完成的动作或状态过或完成的动作或状态,但其结果却和现在有联系但其结果却和现在有联系,也就也就是说是说,动作或状态发生在过去但它的影响现在还存在动作或状态发生在过去但它的影响现在还存在.I have lost my wallet.(含义是含义是:现在我没有钱花了现在我没有钱花了.)Jane has laid the table.(含义是含义是:简已在吃饭简已在吃饭.)Michael has been ill.(含义是含义是:现在仍旧很虚弱现在仍旧很虚弱)He has returned from abroad.(含义是含义是:现在已在此现在已在此地地)（2.）定义）定义2：现在完成时可以用来表示发生在过现在完成时可以用来表示发生在过去某一时刻的去某一时刻的,持续到现在的状况持续到现在的状况,常与常与for,since连用连用.Mary has been ill for three days.I have lived here since 1998.留意：1.现在完成时不能单独与精确时间连用，如yesterday(morning、afternoon),last(morning、afternoon)等，除非与for,since连用.2.现在完成时往往同表示不确定的过去时间状语连用,如already,yet,just,before,recently,still,lately等:He has already obtained a scholarship.I havent seen much of him recently(lately).We have seen that film before.Have they found the missing child yet 3.现在完成时常常与表示频度的时间状语连用,如often,sometimes,ever,never,twice,on several occasion等:Have you ever been to Beijing I have never heard Bunny say anything against her.I have used this pen only three times.It is still good.George has met that gentleman on several occasions.4.现在完成时还往往可以同包括现在时间在内的时间状语连用,如now,up to these few days/weeks/months/years,this morning/week/month/year,now,just,today,up to present,so far等:Peter has written six papers so far.Man has now learned to release energy from the nucleus of the atom.There has been too much rain in San Francisco this year.The friendly relations and cooperation between our two countries have been enhanced in the past few years.Up to the present everything has been successful.5.现在完成时表示现在之前业已完成的动作,虽然其效果或影响仍旧存在但已不再接着,但是有一些现在完成时的句子,在后面加上for+一段时间,则现在完成时的动作就表示持续性.Thomas has studied Russian.(现在不再学俄语)Thomas has studied Russian for three years.(=Thomas began to study Russian three years ago,and is still studying it now6.现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.We have had four texts this semester.现在完成时的“完成用法”和“未完成用法”1.现在完成时的完成用法 现在完成时的完成用法指的是动作发生在过去某一时刻并已结束，但该动作对现在产生了影响，与现在状况具有因果关系。例如：He has turned off the light.他已把灯关了。(动作结束于过去，但说明的是现在的状况-灯现在不亮了。)现在完成时“完成用法”的特点是动作不持续，因此，该时态只能与表示不定的过去时间状语(如：already，yet，before，recently等)、频度时间状语(如：never，ever，once等)、包括现在时刻在内的时间状语(如：this morning month year.，today等)连用。例如：Have you found your pen yet？你已找到你的钢笔了吗？2.现在完成时的未完成用法 现在完成时的未完成用法指的是动作起先于过去某一时刻，始终持续到现在，或可能还要接着下去。例如：He has lived here since 1978.自从1978年以来，他始终住在这儿。(动作起始于1978年，始终住到现在，可能还要接着住下去。)I have been in the army for more than 5 years.我在部队已经呆了五年多了。(动作起先于5年前，始终持续至今，有可能还要接着下去。)此种用法的句中常需一个表示一段时间的状语(由since或for引导)，或表示与现在时刻相连的时间状语(如：up to now，so far)等。例如：I have heard nothing from him up to now.到目前为止我没有他的任何消息。留意：(1)现在完成时的未完成用法只适用于持续性动词，不行用于终止性动词，即瞬间完成或持续时间很短的动词。如：come，go，arrive，leave，join，become，die等。(2)现在完成时常见两种句型：for短语 It is一段时间 since从句.一段时间+has passed+since从句.主语have/has beensince短语例如：He has been in the League for three years.或It is three years since he joined the League.或It has been three years since he joined the.他入团已三年了 一.have/has been doing sth.1.现在完成进行时 当后面接有一段时间的词时,或是加表示时间的词时,可以用现在完成时.假如这件事现在还在持续或还在做,则可用 现在完成进行时.如:I have been skating for 4 hours.I have finished my homework.2.现在完成时的被动语态.后接动词的过去分词.如:The building has been built for 5 years.过去完成时过去完成时 1）概念：表示过去的过去过去完成时：即过去的过去所发生的事情！其构成是主语+had+过去分词。2）用法a.在told,said,knew,heard,thought等动词后的宾语从句。She said(that)she had never been to Paris.b.状语从句在过去不同时间发生的两个动作中，发生在先，用过去完成时；发生在后，用一般过去时。When the police arrived,the thieves had run away.c.表示意向的动词，如hope,wish,expect,think,intend,mean,suppose等，用过去完成时表示原本，未能We had hoped that you would come,but you didnt.3)过去完成时的时间状语before,by,until,when,after,once,as soon as。He said that he had learned some English before.By the time he was twelve,Edison had begun to make a living by himself.Tom was disappointed that most of the guests had left when he arrived at the party.典型例题 The students _ busily when Miss Brown went to get a book she _ in the office.A.had written,left B.were writing,has left C.had written,had left D.were writing,had left答案:D.把书忘在办公室发生在去取书这一过去的动作之前，因此忘了书这一动作发生在过去的过去，用过去完成时。句中when表示的是时间的一点，表示在同学们正忙于这一背景下，when所引导的动作发生。因此前一句应用过去进行时。留意：had no when 还没等 就had no soonerthan 刚 就He had no sooner bought the car than he sold it.过去完成时的用法过去完成时的用法（1）表示过去某一时刻之前已经完成的动作，常与由by，before引导的时间状语连用。We had learned 5000 words by the end of last month.到上个月底为止我已经学了五千个单词。I had finished the composition before supper.晚饭前我就已经把作文写完了。过去完成时的用法过去完成时的用法（2）表示过去某一动作之前已经完成的动作，常与由when，before等连词引导的时间状语从句连用。When I woke up it had already stopped raining.我醒来的时候雨就已经停了。I hadnt learned any English before I came here.我来这儿之前没学过英语。常用于引导这类状语从句的连词有：when当的时候，as soon as一就，before在之前，after在之后，until直到，等。过去完成时的用法（3）用于宾语从句或间接引语中I wondered who had taken the umbrella without permission.我想知道谁不经允许就把雨伞拿去。He told me that he had passed the exam.他告知我他已通过考试。过去完成时的用法（过去完成时的用法（4）某些动词的过去完成时表示一个准备要做却没有某些动词的过去完成时表示一个准备要做却没有做成的事。做成的事。I had intended to come over to see you last night,but someone called and I couldnt get away.昨晚我本准备来看你，但有人来找，脱不开身。昨晚我本准备来看你，但有人来找，脱不开身。We had hoped to catch the early bus,but found it was gone.我们本希望搭早班车，却发觉车已开了。我们本希望搭早班车，却发觉车已开了。这类动词有：这类动词有：intend准备，准备，hope希望，希望，plan支支配，配，mean预定，预定，want想要，想要，think想要，等。想要，等。过去完成时的用法（过去完成时的用法（5）用于表示与过去事实相反的虚拟条件从句中用于表示与过去事实相反的虚拟条件从句中If you had come yesterday,you would have met him.假如你昨天来的话，你就已经见到他的面了。假如你昨天来的话，你就已经见到他的面了。She would have come if she hadnt been so busy.要不是这么忙的话，她就已经来了。要不是这么忙的话，她就已经来了。将来完成时将来完成时将来完成时用来表示在将来某一时间以前已经完成将来完成时用来表示在将来某一时间以前已经完成或始终持续的动作。常常与或始终持续的动作。常常与before+将来时间或将来时间或by+将将来时间连用，也可与来时间连用，也可与before或或by the time引导的现在引导的现在时的从句连用。时的从句连用。1)构成构成（shall）will+have+动词过去分词动词过去分词2)概念概念 a.状态完成：表示某事接着到将来某一时为止始终状态完成：表示某事接着到将来某一时为止始终有的状态。有的状态。b.动作完成：表示将来某一时或另一个将来的动作动作完成：表示将来某一时或另一个将来的动作之前，已经完成的动作或一获得的阅历。之前，已经完成的动作或一获得的阅历。They will have been married for 20 years by then.You will have reached Shanghai by this time tomorrow.将来完成时的构成 将来完成时的构成:由shall/will+have+过去分词构成的。Before long he will have forgotten all about the matter.不久他就会全然遗忘这件事的。He is somebody now.He will not have remembered his old classmates.他现在是一个有身份的人了，他可能不会记得老同学了。Will you have known Kevin for 10 years next month?到下个月你相识凯文该有10年了吧？将来完成时的用法 表示在将来某一时间之前已完成的动作，并往往对将来某一时间产生影响。We shall have learned 12 units by the end of this term.到这个学期末，我们将学完12个单元。By the time you get home I will have cleaned the house from top to bottom.你到家之前我将把房子彻底打扫一遍。表示推想，相当于must have done结构。You will have heard of this,I guess.我想你已经听说过这件事了。I am sure he will have got the information.我信任他确定得到了这个信息在时间和副词从句中，用现在完成时代替将来完成时来表示将来某一时刻以前已完成的动作你看完这部电影之后告知我你对它的看法Tell me what you think about the film when you have seen it.