人教出版英语八学年下Unit9语法(现在完成时)学习课件.ppt
秦老师全品英语课堂,Have you ever been to an amusement park,I 构成：have / has 动词过去分词 （1）has用于主语是第三人称单数, have用于其它人称。 （2）动词的过去分词构成分为规则动词和不规则动词。规则动词在词尾加ed，其规则与过去式一样。不规则动词要记住。,现在完成时用法,表示经历或经验。常与ever或never连用。如： Have you ever been to Hong Kong? Ive never traveled by air. 表示最近发生的动作或情况。常与yet或already连用。如：,用 法,I have already written to her. She hasnt spent much time on it yet. 表示刚刚发生过的动作或事情，常与just连用。 They have just sent us a telegram. She has just come here.,表示过去发生，目前还有可能仍在继续下去的动作或事情。常与since或for连用。 He has lived there since 1950. We have known each other for more than ten years.,结束性动词不能和表示一段时间的时间状语 连用,但是他可以转换成相应的延续性动词.,1.直接用延续性动词 buy have borrowkeep catch(get) a cold have a cold come/go /becomebe put on- wear,2.转换成be+名词 join the army be a soldier Join the Party be a Party member go to school be a student,3.转换成be+形容词或副词 diebe dead finish be over beginbe on leavebe away fall sleep be asleep close be closed,4.转换成 be+介词短语 go to school be in school join the army be in the army,.,1.我们买这本书三年了.,We have had the book for three years.,We bought the book three years ago.,一般过去时态和现在完成时态可以构成 同意句,2.他感冒三天了.,He has had a cold for three days.,He caught a cold three days ago.,3.自从上星期我借的这本书,I have kept the book since last week.,I borrowed the book last week.,4.我成为一个学生两年多了.,I have been a student for over two years.,I became a student two years ago,5.Mr Black死了三年了。,Mr Black has been dead for three years.,Mr Black died three years ago.,6.小名参军半年了。,Xiao Ming has been a soldier for half a year.,Xiao Ming joined the army half a year ago.,7.我们上了8年学了。,We have been students for eight years,当有一个表示过去某时的状语时，不能用现在完成时，而多用一般过去时。 I saw Mary an hour ago. She lost her handbag yesterday .,Next,现在完成时与一般过去时的区别,现在完成时强调动作或事情发生在过去，一直延续到现在，而且还有可能继续延续下去；而一般过去时只表示发生在过去的动作或事情。 I have taught this class for ten years. （还在教） I taught this class for two years. （曾教过两年，现在不教了）,1. Where _ you _, John? Im looking for you everywhere. A. have; been B. have ;been to C. have; gone D. did; go to 2. How long _ your father _ Shanghai? A. did; come B. has; go to C. has; been to D. has; been in,选 择,A. have; been,D. has; been in,3. I _ my watch in my bedroom yesterday. A. leftB. forgot C. have forgottenD. have left 4. She has worked in the factory _. A.since three years agoB. for 1999 C. since in 1999D. since three years,A. left,A.since three years ago,When did Yao Ming start playing basketball?,How long has Yao Ming been playing basketball?,Yao Mings sports life,成龙（ Jackie Chan ） 1954:be born 1961now: act,He has been acting for 44 years.,How long has Jackie Chan been acting?,He has been acting since he was 7 years old.,He has been acting since 1961.,时间状语: 1. for +一段时间 2. since +过去的时间点 3. since +一般过去时的句子,表示动作从过去某一时间开始一直延续到现在或离现在不远的时间。其动作是否继续下去，由上下文而定。这个时态多用于延续性动词。,现在完成进行时,构成： have / has been + V.ing +,1997,2005,started playing table tennis,stopped playing,1989,2005,has been playing basketball,started playing basketball,Deng Yaping played table tennis for 19 years.,Yao Ming has been playing basketball for 16 years.,played table tennis,
