现在完成时讲解练习及答案(共7页).doc
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1、精选优质文档-倾情为你奉上现在完成时态I. 定义: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,也可以表示过去已经开始,一直延续到现在的动作或状态II. 现在完成时的结构肯定句:have/has+ done () 否定句:主语+have/has+not+ done ()+其他.一般疑问句:Have/Has+主语+ done ()+其他.简略答语: Yes, 主语 + have/has.(肯定)No, 主语 + havent/hasnt.(否定)注意:表示短暂时间动作的词,如:come,go,die,marry,buy等的完成时不能与for,since等表示一段时间的词连用。用来持续的动作
2、或状态或表过去重复的动作,如live,study,be,wait等,常和since(自从)或for(经历)引导的词语连用。如:I have lived here for more than thirty years.我已在此住了30多年。III. 现在完成时的标志1.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, 现在完成时通常和,ever, never, twice(once), so far(到目前为止), since,for,in the past/last few years(在过去几年) , already(肯定句), yet(否定,疑问句), just(刚刚), before
3、(以前), recently(近来) 等词连用说明:already与yet都有“已经”的意思,但already常用于肯定句,并用于句中。yet常用于否定句和疑问句,并用于句末。例如:I have already finished my homework. I havent finished my homework yet. Have you finished your homework yet?They have left. (他们已经离开了,也就是说现在他们人不在这里)I have had my lunch. (我已经吃过午饭了,也就是说我现在不饿)I cant find my watch
4、now. I think I have already lost it.2.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。for+时段 since+过去一个时间点(过去 从句)为标志注意: 1)现在完成时不能单独与过去的时间状语连用, 如yesterday, last week, three years ago 等; 2)不能与when连用IV. 现在完成时的用法A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,强调对现在造成的影想或结果)。例如: The car has arrived.车子来了。(结果:车子已在门口)S
5、omeone has broken the window.有人把窗户打破了。(结果:窗户仍破着)B. 表示过去已经开始,持续到现在的动作或状态,可以和表示从过去某一时刻延续到现在(包括“现在”在内)的一段时间的状语连用,如for+时间段、since+过去的时间点、疑问词how long等。例如: My uncle has worked at this factory for five years. 我叔叔在这个工厂工作已经五年了。 Mr. Black has lived in China since 2002. 自从2002年Mr. Black 一直住在中国。 How long have yo
6、u been here? 你来这里多久了? 注意:此种用法中表示持续动作或状态的动词必须是延续性动词(否定句除外)。例如: (1)这本书我已经买了三个月了。 错误:I have bought the book for three months. 正确:I have had the book for three months. (2)你哥哥参军多长时间了? 错误:How long has your brother joined the army? 正确:How long has your brother been in the army/been a soldier?延续性动词与非延续性动词之间
7、的转换 专心-专注-专业leave - be away borrow - keep buy - have die - be dead begin/start - be on finish - be over fall ill -be illget up-be up catch a cold - have a cold put on wearcome/become/go - be here fall asleep - be asleep get to/ arrive/reach - be (in) get to know - know Join -be a member of . (成为的一员)
8、 open -be openclose -be closed用相应的延续性动词替换短暂性动词,句中谓语动词用现在完成时,时间状语为“for时间段”或“since时间点”。如:He has been in the Green China for three years.He has been a member of the Green China for three years.他加入“绿色中国”已经三年了。 The old man died 4 years ago.- The old man has been dead for 4 years.He joined the Party 2 yea
9、rs ago.- He has been in the Party for 2 years.I bought the book 5 days ago.- I have had the book for 5 days. 表示时间段的短语有:for+一段时间(for 2 years), since+从句(since he came here), since+时间点名词( since last year, since 5 days ago),how long; for a long time等。V. 现在完成时态与一般过去时态的区别 1一般过去时表示过去某时发生的动作或单纯叙述过去的事情,强调动作;
10、现在完成时为过去发生的,强调过去的事情对现在的影响,强调的是影响。I saw this film yesterday.(强调动作发生的时间是yesterday 。)I have seen this film.(强调对现在的影响,电影的内容已经知道了。)2一般过去时和表示过去的时间状语连用,如:ago, last week/.In 2008, in the past, just now, the day before yesterday, yesterday .Then(那时),that day, one day, once(从前)现在完成时常和recently(近来),ever, never,
11、 twice, so far(到目前为止), since,for,in the past/last few years , already(肯定句), yet(否定,疑问句), just(刚刚), before(以前)连用。现在完成时不与表示过去的时间状语连用。现在完成时可表示持续到现在的动作或状态,动词一般是延续性的,如live, teach, learn, work, study, know. VI. 比较since和forsince 后接时间点, for后接时间段,试比较:I have lived here for more than twenty years.I have lived
12、here since I was born.My aunt has worked in a company since 1949.I have not heard from my uncle for a long time.VII. 比较 have/has been to、have/has gone to 和 have been inhave(has) been to.表示“曾去过某地,已经从那里回来了”,可以和ever、never、twice等连用。have(has) gone to表示“已经去了某地,在去那里的途中或到达那里还没有回来”。have(has) been in 表示“在某地呆多
13、长时间”,常与表示一段时间的状语连用,如:since, for, how long 等He went to Shanghai last week 上周他去了上海He has been to Shanghai. 他(曾经)到/去过上海.(但他人现在肯定不是在上海而是回来了)He has gone to Shanghai. 他已经去上海了.(也许刚动身出发,也许已经到了,也许还在路上,反正他人不在这里)Mr. Brown has been in Shanghai for three days. 布朗先生来上海已经有三天了语法练习I. 延续性动词和瞬间性动词之间的转化1.He died 10 yea
14、rs ago. He _ for 10 years / since 10 years ago.2. He borrowed the book 2 weeks ago. He _the book for 2 weeks.3. He bought the motorbike a month ago. He _the motorbike for a month.4. He arrived here three days ago.He _here since three days ago.5. They turned off the light 2 hours ago. The light _for
15、2 hours.6. He left here 2 years ago. He _from here for 2 years.7. The film began 30 minutes ago. The film _ for 30 minutes.8. They opened the door an hour ago. The door _ for an hour.9. They closed the door an hour ago. The door _for an hour.10. He joined the army last year. He _ a _ for a year. He
16、_ the army for a year. It _ a year _ he joined the army. II. 单项选择。( )1. The famous writer _ one new book in the past two year . is writing .was writing .wrote .has written ( )2. Have you met Mr. Li _?. Just . ago .before .a moment ago( )3. How long have you _ here ? About two months . been . gone .
17、come . arrived( )4. Our country _ a lot so far .Yes. I hope it will be even _ . has changed ; well . changed ; good . has changed ; better. changed; better ( )5. _ you _ your homework yet ?Yes. I _ it a moment ago.Did; do; finished .Have; done; finished.Have; done; have finished . will; do; finish(
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