初中英语现在完成时解析课件.ppt

1、春天还会远吗春天还会远吗?will it still be far in spring?冬天已经来了冬天已经来了,Winter has already come,现在现在完成完成时态时态WinterWinter has has alreadyalready comecome.现在现在完成完成时的构成形式时的构成形式 have done has助动词助动词过去过去分词分词用来表示之前已经发生或完成的动作或状态，而其结果却和用来表示之前已经发生或完成的动作或状态，而其结果却和现在有联系现在有联系:动作或状态发生在过去动作或状态发生在过去,但它的但它的影响现在还存在影响现在还存在。They have

2、 left.-他们已经离开了他们已经离开了,也就是说现在他们人不在这里也就是说现在他们人不在这里 I have had my lunch.-我已经吃过午饭了我已经吃过午饭了,也就是说我现在不饿也就是说我现在不饿现在现在完成完成时的含义时的含义也可表示也可表示持续到现在持续到现在的动作或状态。的动作或状态。He has learned English since 2001.-从从2001年开始学的年开始学的,现在还在继续学着呢现在还在继续学着呢nowpastfuture一般过去时一般过去时现在完成时现在完成时一般过去时表示的是纯粹在过去发生的事情一般过去时表示的是纯粹在过去发生的事情现在完成时表

3、示的是在过去某个时间开始并持续到现在的动作现在完成时表示的是在过去某个时间开始并持续到现在的动作/状态状态,或者发生在或者发生在过去却对现在造成的影响过去却对现在造成的影响 现在完成时与一般过去时的比较现在完成时与一般过去时的比较 1）一般过去时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；现在完成时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.（强调看的动作发生过了。）（强调看的动作发生过了。）I

4、have seen this film.（强调对现在的影响，电影的内容已经知道了。）（强调对现在的影响，电影的内容已经知道了。）2）一般过去时一般过去时 常与具体的表示过去的时间状语连用常与具体的表示过去的时间状语连用;现在完成时现在完成时通常与模糊的时间状语连用，或无时间状语。通常与模糊的时间状语连用，或无时间状语。一般过去时的时间状语一般过去时的时间状语:yesterday,last week，ago,in1990,in October,just now,-具体的时间状语具体的时间状语现在完成时的时间状语现在完成时的时间状语:for,since,so far,ever,never,just

5、,yet,till/until,up to now,in the past few years,recently,-模糊的时间状语模糊的时间状语句子中如有过去时的时间副词（如句子中如有过去时的时间副词（如 yesterday,last,week,in 1960）时，）时，不能使用现在完成时，要用过去时不能使用现在完成时，要用过去时（错）（错）Tom has written a letter to his parents last night.（对）（对）Tom wrote a letter to his parents last night.3）现在完成时）现在完成时可表示持续到现在的动作或状

6、态，动词一般是延续性的，如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.一般过去时一般过去时常用的非持续性动词有常用的非持续性动词有come,go,leave,start,die,finish,become,get married等。等。She joined the League three years ago.(加入的动作不是延续的加入的动作不是延续的)She has been in the League for three years(since three years ago).(在团内的状态可延续在团内的状态可延续

7、)She has been a League member for three years(since three years ago).(是团员的状态可持续是团员的状态可持续)延续动词表示经验、经历；延续动词表示经验、经历；瞬间动词表示行为的结瞬间动词表示行为的结 果，不能与表示一段时间的状语连用。果，不能与表示一段时间的状语连用。比较延续动词与瞬间动词比较延续动词与瞬间动词 He has finished the work.他已完成了那项工作。他已完成了那项工作。(表结果表结果)Ive known him since then.我从那时起就认识他了。我从那时起就认识他了。(表经历表经历)s

8、ince 用来说明动作起始时间用来说明动作起始时间“自从自从”for用来说明动作延续时间长度用来说明动作延续时间长度“长达长达”I have lived here for more than twenty years.I have lived 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.比较比较since和和for注意：并非有注意：并非有for 作为时间状语的句子都用现在完成时作为时间状语的句子都用现在完成时 I w

9、orked here for more than twenty years.(我现在已不在这里工作。我现在已不在这里工作。)I have worked here for many years.(现在我仍在这里工作。现在我仍在这里工作。)He has gone to Shanghai.他他(已经已经)去上海了。去上海了。He has been to Shanghai.他他(曾经曾经)去过上海。去过上海。比较比较 have/has been to have/has gone toHe went to Shanghai last week.他他(曾经曾经)到到/去过上海去过上海 在他人生中曾经有过这

10、样的在他人生中曾经有过这样的经历经历,但他人现在肯定不是在上海而是回来了但他人现在肯定不是在上海而是回来了他已经他已经去上海了去上海了 也许刚动身出发也许刚动身出发,也许已经到了也许已经到了,也许也许还在路上还在路上,反正他人不在这里反正他人不在这里上周他上周他做了一件事做了一件事:那就是那就是去了上海去了上海He has been to Shanghai.He has gone to Shanghai.He has been in Shanghai for 10 years.他他呆在上海迄今为止已经呆在上海迄今为止已经10年了年了 现在还在上海没现在还在上海没有离开呢有离开呢He lived

11、 in Shanghai for 10 years.以前他以前他在上海住过在上海住过10年年 现在不在上海了现在不在上海了辨析这些句子辨析这些句子由时态导致的由时态导致的含义上的差别含义上的差别1.He died 10 years ago.2.-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.

12、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 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 do

13、or _ _ _ 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 _ _ _ the army for a year.-It _ a year _ he joined the army.延续性延续性动词和动词和瞬间瞬间性性动词之间的转化动词之间的转化1.He died 10 years ago.2.-He has been dead for 10 years/since 10

14、years ago.2.He borrowed the book 2 weeks ago.-He has kept the book for 2 weeks.3.He bought the motorbike a month ago.-He has had the motorbike for a month.4.He arrived here three days ago.-He has been here since three days ago.5.They turned off the light 2 hours ago.-The light has been on for 2 hour

15、s.6.He left here 2 years ago.-He has been away from here for 2 years.7.The film began 30 minutes ago.-The film has been on for 30 minutes.8.They opened the door an hour ago.-The door has been open for an hour.9.They closed the door an hour ago.-The door has been closed for an hour.10.He joined the army last year.-He has been a soldier for a year.-He has been in the army for a year.-It is a year since he joined the army.延续性延续性动词和动词和瞬间瞬间性性动词之间的转化动词之间的转化(keys)