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1、精选优质文档-倾情为你奉上现在完成时1.概念:过去发生或已经完成的动作对现在造成的影响或结果,或从过去已经开始,持续到现在的动作或状态。2.时间状语:recently, lately, sincefor,in the past few years, etc. 3.基本结构:have/has + done 4.否定形式:have/has + not +done. 5.一般疑问句:have或has提前对于初接触现在完成时的人来说,往往会产生一种茫然,因为它似乎与一般过去时相似。那就是,这两种时态描述的动作都始于过去。其实不然,现在完成时主要表示,发生在过去的动作延续到现在刚刚完成、或许还要延续;侧
2、重于这个动作对现在带来的结果、产生的影响、积累的总和等等。而一般过去时则只不过是表示动作发生在过去的什么时候。弄清了这一区别,就很容易理解现在完成时了。它主要适用于下面的几种情况:1)表示截止现在业已完成的动作By now, I have collected all the data that I need .到现在为止,我已收集到了我所需的全部资料。She has read 150 pages today .她今天已看了150页。2)表示发生在过去而对现在产生影响、带来结果的动作Have you had your dinner? 你吃晚饭了吗?3)表示过去发生的动作持续到现在,并可能还要延续
3、It has been five years since he joined the army .他参军五年了。1)一个句子应该用什么时态只能取决于它需要表达的意思,以及它所处的语言环境。例如:He speaks English .(一般现在时,说明动作发生的经常性。)He spoke English when he was in New Zealand .(一般过去时,说明动作发生的时间。)He is speaking English.(现在进行时,说明动作正在进行。)He has spoken English for three years since he came to the USA
4、.(现在完成时,这里说明动作的总和。)He has been speaking English since he came to the USA. (现在完成进行时,强调动作的连续性。)2)在含有时间状语从句或条件状语从句的主从复合句中,如果主句的谓语动词是一般将来时,那么从句的谓语动词就只能用一般现在时来表示将来时;如果主句的谓语动词是过去将来时,那么从句的谓语动词就只能用一般过去时来表示过去将来时。例如:I will not play tennis if it rains tomorrow.I would not play tennis if it rained the next day.
5、3) 有些动词表示无法持续的动作,它们一般不宜用于进行时态中。这类动词常见的有:be , believe , consist , find , forget , hate , have , hope , hear , know , like , love , notice , prefer , remember , see , seem , smell , suggest , taste , understand , want , wish , sit down , stand up 等等。Be动词若是用于进行时态,可表示暂时、短暂的情况或表现。例如:Tom is being a good b
6、oy today .汤姆今天很乖。He is being childish .他这样做是耍孩子气。You are not being modest .你这样说不太谦虚。4)关于现在完成时的时间状语问题A. 凡是完成时态都表示,不知道也不管动作发生的具体时间, 所以在使用现在完成时的句子里,不可以带有表示具体过去时间的状语,如:yesterday , last week ( month , year , etc. ) , two weeks ago , in 1999等;但常和有些副词连用,如: just , before , already , often , never , ever , n
7、otyet , always等等。B. 在以when提问的特殊疑问中不能用现在完成时。另外,ago不能用于现在完成时的句子里,因为它表示从现在算起的以前某个时间,属于表示具体过去时间的状语。但是可以用before 来表示以前的意义,因为它只表示以前,而不知什么时候的以前。C. 如果是不表示连续性的动词用于现在完成时的句子,不可以和以for表示的一段时间的状语连用。在这种情况下,应该用It has been ;since的句式来表达。如:He has joined the army for five years. (错误)It has been five years since he joine
8、d the army.(正确) 能与现在完成时连用词语很多,如副词just, already, yet, before, ever, recently 等,但下面是一些典型而且重要的例子:(1) since(自从):不管用作介词、连词还是副词, 句子(主句)谓语通常都用现在完成时:I havent seen her since last week. 自上周以来我一直未见过她。Where have you been since I last saw? 自我上次见到你之后你到哪里去了?【注】有时可用其他时态的情况,但须注意: 对于某些表示状态的动词(如 seem 等),或因语义等方面的原因,有时可
9、能用一般现在时比较现在完成时更合适:It seems like years since we last met. 我们似乎几年未见面了。Since when does the $42 plus $5 service charge come to $48? 从什么什候开始42元加5元的服务费等于48元了? 若不是指从过去持续到现在,而是指从较远的过去持续到在一个较近的过去,则用过去完成时:Yesterday he told me that he hadnt eaten anything since Tuesday. 他昨天告诉我自星期二以来他一直未吃任何东西。(指从星期二至昨天未吃东西) 表示时
10、间长度时,通常用一般现在时代替现在完成时:Its ten years since he left here. 他离开这儿已10年了。(2) so far(到目前为止): So far there has been no bad news. 到现在为止还没有什么坏消息。We havent had any trouble so far. 到目前为止,我们还没有遇到任何麻烦。 (3) in for, during the past last years(在过去年中):In the past two years Ive seen him little. 过去两年我很少见到他。I have been h
11、ere (for) the last past month. 最近一个月里我都在这儿。【注】在一定的上下文里,若是以过去时间为起点,也可用过去完成时。(4) up to until now(到现在为止):Up to now, the work has been easy. 到现在为止这工作还算容易。I have heard nothing from him up to now. 到现在为止我还没有听到他一点音信。(5) Its will be the first time that(第一次):Its the first time Ive come here. 这是我第一次来这儿。1考点1:时间
12、状语。1、表示过去发生或已经完成的动作对现在造成的影响或结果。常与never/ever,just,already/yet,before,so far等连用。Yet常用于一般疑问句和否定句. 2、during/in the past + 时间段3、表示动作或状态从过去某时开始,一直延续至今,可能刚刚结束,也可能延续下去。常与for, since, how long, these days等连用。 区分 for/sincesince后接时间点,表“自.以来”,如1993,last term, yesterday. Since后跟句 子,句子要用一般过去时。for后接一段时间,表“长达多久”,如te
13、n years, a while, two days等。 for+时段= since+时段+ago现在完成时一 基本结构:助动词have/has+过去分词(done) 二句型:否定句:主语+have/has+not+过去分词+其他.一般疑问句:Have/Has+主语+过去分词+其他.三用法(1)现在完成时表示过去发生或已经完成的动作对现在造成的影响或结果I have spent all of my money.(含义是:现在我没有钱花了.) They have come here. (含义:他们现在在这儿)(2)现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作或状态,常与for和s
14、ince连用for+时段since+过去一个时间点(译为:自从以来)since+时段+agosince+从句(过去时)It is+时段+since+从句(过去时) Mary has been ill for 3 days. (since 3 days ago) I have been in the university since 2002.四has gone (to),has been (to), has been (in) 的区别Have/Has gone(to) :去了(现在不在说话现场)Where is your father?He has gone to Shanghai. Have
15、/Has been (to) :去过(已不在去过的地方)My father has been to Shanghai. Have/has been in:呆了多久(还在所呆的地方)My father has been in Shanghai for two months. /since two months ago.五现在完成时的标志现在完成时的含义是过去已经完成的动作对现在仍有影响,用以下四大标志词可以表达这种含义: 以already, just和yet为标志 He has already got her help.他已得到她的帮助。He has just seen the film.他刚刚
16、看过这场电影。以ever和never为标志This is the best film I have ever seen.这是我曾经看过的最好的一部电影。 He has never been to Beijing.他从没有到过北京。以动作发生的次数为标志He says he has been to the USA three times. 他说他已经去过美国三次了。以so far(到目前为止)为标志He has finished all of his work so far.到目前为止他完成了所有的工作注意: 1)现在完成时不能单独与过去的时间状语连用, 如yesterday,last week
17、, three years ago 2)不能与when连用 六过去分词1 、规则动词:规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。 (1)、一般动词,在词尾直接加“ ed ”。 work-worked-worked ,visit-visited-visited (2)、以“ e ”结尾的动词,只在词尾加“ d ”。 live-lived-lived , (3)、以“辅音字母 + y ”结尾的动词,将 y 变为 i ,再加“ ed ”。 study-studied-studied ,cry-cried-cried (4)、重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,
18、再加“ ed ”。 stop-stopped-stopped , drop-dropped-dropped 2 、不规则动词:AAA型burst hurt let cast cut hit put set shut spreadread原形发音为/ri:d/过去式,过去分词发音为/red/AAB型 beat beat beaten ABA型become became becomerun ran runcome came comeABB型build built builtcatch caught caughtfeel felt feltABC型 begin began begunbreak br
19、oke brokenchoose chose chosen七 瞬间动词变延续性动词(buy,die,join,come,go ,leave,join )不能直接与for since 连用。要改变动词buy-haveborrow -keep come/arrive/reach/get to-be in go out-be outleave -be awaybegin-be onfinish-be overopen-be openclose -be closed die-be dead1.have代替buy My brother has had this bike for almost four
20、years. 2、用keep或have代替borrow I have kept the book for quite a few days. 3、用be替代become How long has your sister been a teacher? 4、用have a cold代替catch a cold Tom has had a cold since the day before yesterday. 5、用wear代替put on 6、用be+代替终止性动词用“be形容词”代终止性动词 1、bemarried代marry2、beill代fall (get) ill 3、bedead代d
21、ie4、beasleep代fall (get) asleep 5、beawake代wake/wake up6、begone代lose,die,sell,leave 7、beopen代open8、be closed代close/shut 9、bemissing(gone,lost)代lose 用“be副词”代终止性动词 1“beon”代start,begin 2“beup”代get up 3“beback(to)”代return to,come back to,go back to 4“be here (there)”代come(arrive,reach,get) here或go (arrive
22、,reach,get) there等等用“be介词短语”代终止性动词 1.“be in/at +地点”代替go to /come to 2.用be in the army 代替join the army举例:常用瞬间动词变延续性动词1. have arrived at/in sw. got to/reached sw. come/gone/moved to sw.have been in/at/on sw2. have come/gone back/returned have been back 3. have come/gone out have been out4. have become
23、 have been5. have got up have been up; 6. have fallen asleep/got to sleep have been asleep; 7. have finished/ended/completed have been over; 8. have begun have been on9. have borrowed/bought have kept/had 10. have/has gone to have been in参考答案:一、单项选择。1、B2、现在完成时常与already(已经),just(刚刚,正好),ever(曾经),never
24、(从来,也不;从不),before(以前),yet(仍然)等连用。故2应选B。3、C4、现在完成时常与recently(近来),so far(到目前为止),in the past/last + 一段时间等时间状语连用。因为上述短语表示的是从现在起往前推算的一段时间,句中的动作是从过去某一时间或时刻开始持续到现在的。故4应选D。5、C6、现在完成时时常与for +时间段或since +过去时间点连用(含从句,从句过去时)。故6应选C。7、C8、现在完成时还与once(一次),twice(两次),three times(三次),several times(几次)等表示重复次数的词语连用。故8应选B
25、。9、现在完成时与一般过去时容易混淆,就是因为它们所表示的动作都发生在过去,但二者又有区别:一般过去时表示过去某个时间发生的事、存在的状态或经常发生的动作,说话的侧重点在于陈述一件过去的事情,与现在没有关系;现在完成时表示与现在有关系的发生在过去的动作,它不与表示过去的时间状语(如yesterday , last week , a moment ago等)连用。故9的正确答案为B。10、B11、现在完成时中,非延续性动词不能与for和since引导的表示一段时间的状语连用,通常是用相应的延续性动词来代替。故11的正确答案依次为:D。12、B 13、A 14、C 15、A。16、have/has
26、 gone to + 地点表示某人去了某地(还未回来),指主语所指的人不在这儿。have/has been in + 地点表示在某地呆了多长时间,常与表示时间的状语连用。have/has been to +地点表示曾经去过某地(但现在已不在那儿)。故16的正确答案为A。17、A 18、D 19、C 20、C二、句型转换。1、has he? 2、How long 3、died, has been dead 4、has been open 5、has been away 6、joined;ago7、It is, since 8、The bus has been here for ten minutes.三、汉译英。1、Jim has finished doing his homework already. He is free now.2、He received a letter yesterday.3、My father has been to the Great Wall before.4、She hasnt seen the new film yet.5、She has been to Shanghai.6、Where has he been these days? 专心-专注-专业