新广州版八年级上册英语Unit5-Educational-exchanges-语法专项--现在完成时

1、现在完成时1 unit 5: educational exchanges 语法专项 -现在完成时如果你想说 “ 我已经看过某部电影，所以不想看了” 、“ 某人曾经做过什么事情 ” 等等，该如果表达呢？首先请看下面的句子：（1）i have seen the film. i dont want to see it again.这部电影我已经看过，不想再看了。（2）have you answered all the questions? 所有的问题你都回答了吗？（3）have you ever looked at a travel brochure? 你看过旅游宣传册吗？（4）she has ne

2、ver visited the usa. 她从没有过去美国。观察：以上句子的谓语动词的一个共同特点是_, 用于表示在以前的某个时间曾经做过的、发生的事情，这种行为对目前有某种影响。我们把这种时态称为“ 现在完成时 ” 。一、 现在完成时的概念。表示过去发生的动作对现在造成的影响或结果she has been ill for three days. （她病了三天了。）表示从过去某一时间开始一直持续到现在的动作或状态。weve known each other since we were children. （我们从小就认识。）i have been a member of the party f

3、or 10 years. 常与现在完成时连用的时间状语有：just 刚刚yet 仍然，还now 现在lately 最后ever 曾经today 今天never 从未before 从前recently 最近already 已经this week 本周since 自从for a long tine 很长时间了since then 自那以来so far 到目前为止in the past/last few years 在过去 /最近的几年二、构成： ” 助动词 have, has + 过去分词 ”现在完成时态的肯定句、否定句和疑问句形式（以work 为例） ：人称肯定否定疑问回答第一人i have s

4、een the ufo. we have i haven t seen the ufo. we havent have you seen the ufo? yes, i have./ no, i havent.现在完成时2 称travelled around the world. travelled around the world. have you travelled around the world? yes, we have./ no, we havent.第二人称you have been to england. you havent beento england. have you

5、 been to england? yes, i/we have. no, i /we havent.第三人称he/she has been to beijing. they have given concerts all over the world. he/ she hasnt been to beijing. they havent given concerts all over the world. has he/ she been to beijing? have they given concerts all over the world? yes, he/she has. no,

6、 he/she hasnt.yes, they have. no, they havent.注：规则动词的过去分词的构成与过去是相同，不规则动词的过去分词见附表。随堂练习.把下面变否定句、一般疑问句并作肯定和否定回答。1. i have done my homework. 否定句： _ 一般疑问句： _ 回答： _ 2. the plane has arrived. 否定句： _ 一般疑问句： _ 回答： _ 三、动词的过去分词构成规则（1） 规则变化 大部分动词在词尾直接加-ed clean cleaned help helped 以不发音的 e结尾的，直接加 -d like liked l

7、ive lived 以辅音字母 +y 结尾的单词，变 y 为 i 再加 ed try tried study studied 重读闭音节词尾只有一个辅音字母的，需要双写最后这个辅音字母再加-ed. plan planned stop stopped （2） 不规则变化see seen find found 需根据不规则变化表进行专门记忆现在完成时3 随堂练习写出下列单词的过去分词形式work _ finish _ arrive_ change_ see_ have_ marry_ visit_ miss_ prefer_ do_ hear_ live_ clean_ study_ meet_

8、be _ climb_ plan_ take_ stop_ keep_ buy_ spend_ learn_ forget_ bring_ 四、 现在完成时用法归纳1. 现在完成时表示过去发生的动作现已完成，对现在造成的影响和结果。(此种用法谓语动词用结束性动词) 如： the plane has arrived. 常用的时间状语和副词：already ,yet , ever , never already 已经； yet 尚未，仍未，还；强调前不久完成的动作对现在造成的影响，谓语动词使用非延续性动词。already 用于肯定句中， yet 用于否定句和疑问句的句末。例如： i have al

9、ready finished my homework. 我已经完成我的家庭作业了。he hasn t come yet.他还没有回来。has she finished cooking yet? 他做完饭了吗？练：i have already done my homework. ( 变为否定句 ) _ ever (曾经)，句中； never (从不) ，表示否定，强调到目前为止的生活经历。谓语动词用延续性动词。例如： have you ever climb that mountain? 你曾经爬过那座山吗？现在完成时4 have you ever been to shanghai? 你曾经去过上

10、海吗？i have never late for school. 我从来没有迟到过。already ever与 never应位于助动词 have/has 之后，主要动词之前。拓展： before (以前)，句尾，独立用i haven t met him before. 我以前从来没有见过他。just (刚刚)，用于肯定句中，常用在助动词和过去分词之间。如：i have just heard the news. 我刚刚听到消息。跟踪训练（）1. have you _ heard of disneyland? a. always b. ever c. never d. sometimes （）2.

11、 i have _ finished my homework. so i can have a rest now. a. ever b. already c. never d. yet （）3. she is a good student, she has _ been late for school. a. ever b. already c. never d. yet （）4. i am very hungry , i haven t had my breakfast_. a. ever b. already c. never d. yet 2. 完成时可用于表示某时间段里完成的动作，常与

12、today, these days, recently等时间状语连用。 如：have you seen her these days? 译： _ have you been to the library today? 译：_ have you read the book recently? 译：_ 3.现在完成时表示过去已经开始，持续到现在，可能延续到将来的动作和状态。常与表示过去某一时刻延续到现在的一段时间状语连用。如：a. for + 一段时间： for two hours 现在完成时5 b. since + 时间点： since 1999, since last year c. sinc

13、e + 一段时间 + ago: since two days ago d. since + 从句（用过去时）e. up to now, till now, until now, so far f.in the past two years, in the last few days g. recently, lately 如： miss zhao has taught math for five years. his mother has worked in the shop since 1990. the greens have lived in london since three yea

14、rs ago. 注：其中在 a,b,c,d 这四种结构中，谓语动词必须为延续性动词。如： i have had this book for one and a half years. ( 这本书我已买了一年半了！) 跟踪训练用 since 或者 for 填空1. i have studied english _ 5 years. 2. i have studied english _ 5 years ago. 3. i have studied english _ 2008. 4. she has taught math _ 3 years. 5. she has taught math _

15、3 years ago. 6. she has taught math _ 2010. 4. 短暂性动词怎样和表示一段时间的状语连用。英语中的短暂性动词， 也叫做终止性动词、 瞬间动词或非延续性动词， 只表示一不能用 buy 现在完成时6 时的动作，在肯定句式中不能与表示延续的时间状语连用。常见的短暂性动词有：go, come, leave, find, buy, arrive, give, stop, join, marry, die, begin, start, borrow, close, open, lend等。eg. i have bought this book for three

16、 months. () 非延续性动词与一段时间连用时可采用下列三种方法：（1）将非延续性动词转化为延续性动词。leave- have (has) been away from close- be closed join- have (has) been (in) begin/start- be on buy- have (has) had go- be there die- have (has) dead finish- be over come (arrive)- have (has) been here borrow- have (has) kept begin to work- have

17、 (has) worked open- have (has) been open get up- have (has) been up put on have (has) on come back- have (has) been back gone (left)- been away joined been got to know known （2）时间状语的变化：把表时间的状语“for ”变为“ 数词+ 时间名词 +ago” 的短语形式。（即：将时间状语改为过去时间，并用一般过去时代替现在完成时）如： 他参军五年了。（判断正误）he has joined the army for five

18、 years. ( ) he has been in the army for five years. ( ) he joined the army five years ago. ( ) 他离开济南三年了。he has left jinan for three years. ( ) he has been away from jinan for three years.现在完成时7 he left jinan three years ago.(3) 句子模式的变化。用句型“it is + 一段时间 + since从句” （从句中的谓语动词用非延续性动词的一般过去式表示）如：the old m

19、an died two years ago. = the old man has been dead for two years. = it is two years since the old man died. 跟踪训练句型转换。1. i have borrowed a new book from the school library. i _ _ a new book from the school library for two days. 2. she has gone there. she _ _ there _ yesterday. 3. the film has begun.

20、the film _ _ _ _ five minutes. 4. the boy has come back. the boy _ _ _ for an hour. 5. the man in a hat has left. the man in a hat _ _ _ _ half an hour ago. 6. he has already died. he _ _ _ for twenty years. 7. the young man has joined the league. the young man _ _ _ member _ two years. the young ma

21、n _ _ _ _ league _ two years 现在完成时8 ago. 5. have been to/ have gone to/ have been in 三种结构的区别（1）have been to 去过某地 (现已离开 )，可以与 ever, never, once, twice 等连用。（2）has gone to 去某地了，说话时某人已离开此地，在去某地的路上或已在某地，总之现在还未回来。此句型一般用于第三人称。（3） have been in 表示已在某地呆了多久，若该地为小地方则用at。翻译：你以前去过北京吗？ _ 吉姆已经去了伦敦。 _ 格林一家在中国已经两年了。_

22、 单项选择( )1. i have _ beijing three times. a. been to b. gone to c. been in d. been at ( )2.-where is mike? -he has _ london . a. been to b. gone to c. been in d. been at ( )3. tony has never _ china. he looks forward to coming to china a. been to b. gone to c. been in d. been at ( )4.lucy has _ china

23、 for 5 years. a. been to b. gone to c. been in d. been at ( )5.the teacher has _ the village to teach the poor students for 10 years. 现在完成时9 a. been to b. gone to c. been in d. been at 6. 现在完成时与一般过去时的区别：(1) 侧重点不同：现在完成时是与现在有关的时态，属现在时态范畴，它侧重于过去的动作对现在造成的影响。 而一般过去时是一种过去时态， 侧重于表示过去的动作，与现在无关。如：yesterday i

24、 went to the zoo. ( 仅说明昨天去了动物园，与现在无关) li lei has read the book. ( 说明李磊了解那本书的内容) （2）连用的时间状语不同：一般过去时常与ago, yesterday, last , in 2000, just now等连用。 而现在完成时与 already, yet, still, just, so far, in the last/ past, before, ever, never, since, for等时间状语连用。注 现在完成时不可与yesterday, last week, two days ago 等过去时间状语连用

25、。综合训练一、单项选择。（）1. miss gao isn t here. she _ to the bus station to meet mr. brown. a. go b. has gone c. has been d. would go （）2. how clean the bedroom is! - yes, i am sure that someone _it. a. cleans b. cleaned c. has cleaned d. had cleaned （）3. drison break is the best american tv player that i _ t

26、hese years. a. watch b. will watch c. have watched d.was watching （）4. i m not hungry because i _ lunch already. a. have b. had c. am having d. have had （）5. how long have mr and mrs smith_? - for more than twenty years. a. married b. had married c. got married d. been married 现在完成时10 （）6. in the pa

27、st few years there _ great changes in my hometown. a. have been b. were c. had been d. are （）7. _ you _ the film harry potter ? not yet. i ll see it this sunday. a. did, see b. are; seeing c. have, seen d. do, see （）8. the smiths moved to china ten years ago and _ here since then. a. has lived b. wa

28、s living c. live d. have lived （）9. will you watch the world cup match this year? - no, but i _ several world cup matches since i was a small child. a. had seen b. see c. was seeing d. have seen （）10. i won t return the book to the library because i _ reading it. a. wasn t finish b. don t finish c. wont finish d. haven t finished （）11. how many times _ you _ the great wall? - only once. i _ there three years ago. a. did, go to, have gone b. had, gone to, went c. have, been to, went d. have, been to,