人教版英语八年级下Unit9语法现在完成时课件

1、have you ever been to an amusement parki 构成：构成：have / has 动词过去分词动词过去分词 （1）has用于主语是第三人称单数用于主语是第三人称单数, have用于其它人称。用于其它人称。 （2）动词的过去分词构成分为规则动词）动词的过去分词构成分为规则动词和不规则动词。规则动词在词尾加和不规则动词。规则动词在词尾加ed，其规其规则与过去式一样。不规则动词要记住。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。常与表示经历或经验。常与ever或或never连用。如：连用。如： have you ever been to ho

2、ng kong? ive never traveled by air. 表示最近发生的动作或情况。常与表示最近发生的动作或情况。常与yet或或already连用。如：连用。如：用用 法法 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，常与表示刚刚发生过的动作或事情，常与just连用。连用。 they have just sent us a telegram. she has just come here. 表示过去发生，目前还有可能仍在表示过去发生，目前还有可能仍在继续下去的动

3、作或事情。常与继续下去的动作或事情。常与since或或for连用。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结束性动词不能和表示一段时间的时间状语连用连用,但是他可以转换成相应的延续性动词但是他可以转换成相应的延续性动词.1.直接用延续性动词直接用延续性动词 buy have borrowkeep catch(get) a cold have a cold come/go /becomebe put on- wear2.转换成转换成

4、be+名词名词 join the army be a soldierjoin the party be a party membergo to school be a student 3.转换成转换成be+形容词或副词形容词或副词 diebe dead finish be over beginbe on leavebe away fall sleep be asleep close be closed4.转换成转换成 be+介词短语介词短语 go to school be in school join the army be in the army.1.我们买这本书三年了我们买这本书三年了.w

5、e 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一般过去时态和现在完成时态可以构成 同意句同意句2.他感冒三天了他感冒三天了.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我成为

6、一个学生两年多了.i have been a student for over two years.i became a student two years ago5.mr black死了三年了。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。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.我们上了我们上了8年学了。年学了。we

7、have been students for eight years 当有一个表示当有一个表示过去某时的状语时过去某时的状语时，不，不能用现在完成时，而多用一般过去时。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 .现在完成时与一般过去时的区别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续下去；而一般过去时只表示发生在过去的动作或事情

8、。动作或事情。 i have taught this class for ten years. （还在教）还在教） i taught this class for two years. （曾教过两年，现在不教了）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 to2. how long _ your father _ shanghai? a. did; come b. has; go toc. ha

9、s; been to d. has; been in选选 择择a. have; beend. has; been in3. i _ my watch in my bedroom yesterday.a. leftb. forgotc. have forgottend. have left4. she has worked in the factory _.a.since three years agob. for 1999c. since in 1999d. since three yearsa. lefta.since three years agowhen did yao ming sta

10、rt playing basketball?how long has yao ming been playing basketball?yao mings sports life1980was born1989started playing basketballhe started playing basketball in 1989.he has been playing basketball since 1989.he has been playing basketball for 16 years.2005playshas been playing16 years成龙（成龙（ jacki

11、e chan ）1954:be born1961now: acthe 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.时间状语时间状语: 1. for +一段时间一段时间 2. since +过去的时间点过去的时间点 3. since +一般过去时的句子一般过去时的句子 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。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。这个时态多用于延续性动词。现在完成进行时现在完成进行时构成：构成： have / has been + v.ing + 19972005started playing table tennisstopped p