初中英语词汇语法 现在完成时

1、初中英语词汇语法 第十二讲现在完成时 第一部分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,也可表示过去已经开始,一直延续到现在的动作或状态。学习现在完成时,先从结构和句式开始:构成:主语 + have/has + 过去分词 + 其他。(当主语是第三人称单数时用has,其余人称用have。过去分词:规则动词的过去分词构成与动词过去式相同;不规则动词需要特殊记忆。)否定式:主语 + haven't/hasn't + 过去分词 + 其他。疑问式: Have /Has + 主语 + 过去分词 + 其他?简略答语: Yes, 主语 + have/has.(肯定)No,

2、主语 + haven't/hasn't.(否定)第二部分现在完成时的含义之一是过去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 already, just和yet 表示到现在为止动作或状态已经、刚刚或还没有发生。He has already got her help.他已得到她的帮助。He has just seen the film.他刚刚看过这场电影。He hasn't come back yet.他还没有回来。* 以ever和never为标志ever和never 表示到现在为止动作或状态曾经或从来没有

3、发生过。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若某一动作到现在为止已经发生了若干次,则要使用现在完成时。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为标志so far往往表示到目前为止动作或状态已经发生。He has got to Beijing so far.到目前为止他已到了北京。She has passed the examso

4、far.到目前为止她已经通过了考试。第三部分过去已经开始的动作一直延续到现在, 甚至有可能继续延续下去,我们可以从动作“延续”的特性和“时间”点段的区分入手,进一步学习现在完成时。*“终止”、“延续”要转换英语中的动词从词义上可以分为延续性和非延续性两种,在现在完成时态中一定要注意动词这一特性,应将这类非延续性动词转换为延续性动词。如:“The cat play” has been on for half an hour.猫已经开演半个小时了。How long have you had this dictionary?这本字典你买了多久了?初中阶段常见的有:come-be, go out -b

5、e out, leave-be away (from), begin-be on, buy-have, borrow-keep , join-be a member / 介词短语, die-be dead, become-be, open(v.)-be open(adj.) 等。* 时间“点”、“段”须分清过去开始的动作可以延续到某一点结束,也可能继续延续,这时就要根据时间“点”、“段”选择相应的介词for或since。如:He has been away for two years.他已走了两年。(for+时间段)He has been an English teacher since 19

6、92.自从1992年以来他一直当英语教师。(since+过去某一时刻)第四部分一、动词的过去分词形式：通常一个动词的过去分词和他的过去式是一样的，在动词后面加ed构成过去分词，但是有一些动词的过去分词有不规则的形式。be-been go-gone come-come run-run swim-swum fly-flown see-seen speak-spoken do-done give-given hide-hidden become-become take-taken get-gotten / got break-broken shake-shaken wake-waken a

7、wake-awaken rise-risen lay-lain fall-fallen begin-begun know-known forget-forgotten write-written choose-chosen drink-drunk eat-eaten bite-bitten show-shown  She has forgotten her name. She has amnesia. 她已经忘记了自己的名字。她有健忘症。 I have already drunk the coffee. 我已经喝过咖啡了。 They have gone to see the

8、 President. 他们已经去见校长了。 She has come to see you. 她来看过你了。 二、当have被用在现在完成时态中时，它可以和前面的代名词一起组成缩写形式。I've been to New York once before. 我曾经到过纽约。 He's gone to the fish market. 他已经去过鱼市了。 We've come to help. 我们已经提供了帮助。 三、现在完成时用not来表达否定形式。当有not出现的时候，have可以和not组成缩写，但是此时不能和前面的代名词组成缩写。She hasn

9、9;t spoken to him. 她还没和他说过话。 提问的时候，have需要被提到句首。 Have you seen Matthew? 你见过马休了么？ 四、简单过去时和现在完成时在一定程度上有共同之处，当然事实上两者之间有本质区别。当需要指明过去一个特定的时刻发生的事情时，需要使用简单过去式。He finished three days ago. 他三天前做完了工作。 They finished a long time ago. 他们老早就完成工作了。 五、当没有特定指明的时间，现在完成时和一般过去时都可以使用。I have already finished. 我早就完工了。

10、 I already finished. 我早就完工了。 一般过去时比现在完成时更能表达事情的结果。 John has taught math for twenty years. 约翰已经教了20年的数学。 John taught math for twenty years. 约翰教了20年数学。 在上面的句子中，第一句保留了约翰继续教数学的可能性。第二句表明约翰已经不再教数学了，他可能退休了，换工作了，或者去世了。 Steve and Carol have eaten at that restaurant twice. They really like it.史

11、蒂文和卡洛尔已经在那家饭店吃过两次饭了。他们真的喜欢那里。 Steve and Carol ate at that restaurant twice. 史蒂文和卡洛尔两次在那家饭店吃饭。 六、如果一件事情发生在过去并且延续到说话的这个时刻，就需要使用现在完成时。 They have lived here for a long time. 他们在这里已经生活了很长一段时间。 She has been in Australia for two years. 她到澳大利亚已经两年了。 We have studied for 5 hours straight. 我们已经连

12、续学习了5个小时。 Tim has waited for 30 minutes. 蒂姆已经等了30分钟了。 下面的句子包含了“动作在过去发生并且已经结束”的含义。      They lived here for a long time. 他们在这里住了很长一段时间 Melissa waited for 30 minutes. 梅丽莎等了30分钟。 通常当句子里有since时我们使用现在完成时。We have lived here since June. 我们从六月份开始就住在这里。 She has been in

13、 China since last month. 她从上个月起就在中国了。 当现在完成时前有might时，就算主格是第三人称单数形式，我们还是使用have的动词原型形式。She might have forgotten to lock the door. 她可能忘记了关门。 He might have given the painting to someone. 他可能已经把画给别人了。 Should、could、must没有简单过去时.他们用现在完成时来表达过去的状态。 He should have told you earlier. 他应该早点告诉你的。 I shoul

14、d have tried harder. 我应该更努力的。 She could have been nicer. 她可以做得更好的。 You must have seen him. 你一定已经见过他了。  现在完成时和一般过去时的区别一、现在完成时一般不与表示过去某具体时间的词语搭配使用；一般过去时常常与过去的某个具体时间搭配使用。如：I went home at 10:00 yesterday.         I have got home now. 二、现在完成时-ever和ne

15、verever和never常用于现在完成时，放在过去分词前面；表示“经历”。ever表示“曾经”，never表示“从不”；not ever=never。现在完成时-ever和never。ever多用于疑问句，never一般用于否定句；例句：Have you ever been to Japan?（你去过日本吗？）I have never been to Japan.（我从未去过日本。）三、现在完成时一般疑问句的回答现在完成时的结构是：“have/has + 过去分词”，这里have是助动词，因此，现在完成时的一般疑问句的结构是：Have/Has +主语+过去分词?四、现在完成时一般疑问句的回答

16、简要回答这类疑问句时结构为：Yes, 主语+have/has. No, 主语+havent/ hasnt.为了进一步说明，常常再加一句一般过去时的句子，如：A:Have you been to Shanghai?    B: Yes, I have. I went there last year.have been / have gonehave been to表示“去过某地”（表示过去的经历，现在已经回来）have gone to表示“去了某地”（表示出去了，还没有回来）现在完成时专项练习单项选择。1、Both his parents look sad . Ma

17、ybe they _what's happened to him .（呼和浩特）. knew . have known . must know .will know2、He has _ been to Shanghai , has he ?. already .never .ever . still 3、Have you met Mr Li _？. just . ago .before . a moment ago4、The famous writer _ one new book in the past two year . is writing .was writing .wrot

18、e .has written5、Our country _ a lot so far .Yes . I hope it will be even _ . has changed ; well . changed ; good. has changed ; better . changed ; better 6、Zhao Lan _already _in this school for two years . was ; studying . will ; study. has ; studied . are ; studying 7、We _ Xiao Li since she was a l

19、ittle girl . know . had known . have known . knew8、Harry Potter is a very nice film .I_ it twice . will see . have seen . saw .see9、These farmers have been to the United States . Really ? When _ there ?. will they go . did they go. do they go . have they gone 10、_ you _ your homework yet ? Yes . I _

20、 it a moment ago . Did ; do ; finished . Have ; done ; finished. Have ; done ; have finished . will ; do ; finish11、 His father _ the Party since 1978 . joined . has joined . was in . has been in 12、Do you know him well ? Sure .We _ friends since ten years ago . were . have been . have become . have

21、 made 13、How long have you _ here ?About two months . been . gone . come . arrived 14、Hurry up! The play _ for ten minutes . has begun . had begun. has been on . began15、 It _ ten years since he left the army . is . has . will . was16、 Miss Green isn't in the office . she_ to the library .has go

22、ne . went .will go . has been 17、My parents _ Shandong for ten years . have been in . have been to. have gone to . have been18、The students have cleaned the classroom, ? A. so they B. dont they C. have they D. havent they19、 has Mr White been a member of Greener China since he to China?A. How soon, comes B. How often, got C. How long, came D. How far, arrived 20、 His uncle for more