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1、四、现在完成时四、现在完成时现在完成时用来表示之前已发生或完成的动作或状态，其结果的确和现在有联系。 动作或状态发生在过去，但它的影响现在还存在；也可表示持续到现在的动作或状态。 简单地讲现在完成时就是表示：“结果、影响和持续”。其构成： have (has) +过去分词。一般过去时与现在完成时的比较 1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；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。 2过去时常与具体的时间状语连用，而现在完成时通常与模糊的时间状语连用，或无 时间状语。 一般过去时常用的时间状语： yesterday, last week, ag
2、o, in1980, in October, just now, 具体的时间状语 现在完成时的时间状语或副词： for, since, so far, ever, never, just, yet, till / until, up to now, in past years 3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.解析： 1.英语动词根据词义可分为两种,一种是延续性的,一种是终止性的,终止性动词(也可称为非延续性动词,瞬间动词,或点动词),如 begin,start,die,buy,leav
3、e, come 等,表示动作的发生与结束于一瞬间完成,不能再延续,所以它的现在完成时不能和表示延续的时间状语连用,即不能与表示一段时间的状语,for+时间段, since+时间点/从句连用,也不能用在 how long引导的特殊疑问句中. 常见终止性动词与延续性动词(或状态动词)的对应关系如下come/go/arrive/get/reach/move-be in/at open-be open buy-havedie-be dead close-be closed become-be borrow-keep begin/start-be on put on-wear leave-be away
4、 (from) fall asleep-be asleep end/finish-be overjoin the army-be in the army / be a soldier eg. Ive left Shanghai for three days.() Ive been away from Shanghai for three days.( ).I left Shanghai three days ago. ( ) It is /has been three days since I left Shanghai.( ) 句子中如有过去时间的名词或副词(如 yesterday, las
5、t week, in 1960)时，不能使用现在 完成时，要用过去时。 Tom has written a letter to his parents last night. (错) Tom wrote a letter to his parents last night. (对) 用于现在完成时的句型 1It is the first / second time. that结构中的从句部分，用现在完成时。 It is the first time that I have visited the city. It was the third time that the boy had been
6、 late. 2This is the that结构，that 从句要用现在完成时. This is the best film that Ive (ever) seen.这是我看过的最好的电影。 This is the first time (that) Ive heard him sing. 这是我第一次听他唱歌。3.现在完成时中 been to, gone to 区别gone to 去某地了,说话时某人已离开此地,在去某地的途中或已在某地, 典型例题 1Do you know our town at all? No, this is the first time I _ here. Aw
7、as Bhave been Ccame Dam coming 2Have you _ been to our town before? No, its the first time I _ here. Aeven, come Beven, have come Cever, come Dever, have come 注意： 1非延续性动词的否定形式可以与表示延续时间的状语连用。即动作不发生的状态是 可以持续的。 (错)I have received his letter for a month. (对)I havent received his letter for almost a mont
8、h. 2比较 since 和 for since 用来说明动作起始时间，for 用来说明动作延续时间长度。 I have lived here for more than twenty years. I have lived here since I was born. 注意：并非有 for 作为时间状语的句子都用现在完成时。 I worked here for more than twenty years. (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。) 小窍门：当现在完成时+一段时间，这一结构中，我们用下面的公式转
9、化，很容易就能 排除非延续动词在完成时中的误使。 （1）Tom has studied Russian for three years. (对) =Tom began to study Russian three years ago, and is still studying it now. （2）Harry has got married for six years.(错) =Harry began to get married six years ago, and is still getting married now. 显然，第二句不对，它应改为 Harry got married
10、six years ago. 或 Harry has been married for six years. 3since 的四种用法 （1）since过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half past six)。 I have been here since 1989. （2）since一段时间ago I have been here since five months ago.（3）since从句 Great changes have taken place since you left. （4）It is 一段时间since 从句 It i
11、s two years since I became a college student. 练习1. Its a long time since we _ (meet) last, isnt it? 2.-I know you _ (choose) a picture book among these. -Yes, Have a look at it, please. 3. So far, spaceships without people _ (reach) the moon and some other parts of the universe. 4. My father_ home f
12、or nearly three weeks.A .has gone away from B. has left C .has been away from D. went away 5 .Mr and Mrs Green have_in China for a week. A .been B. got C .arrived D. reached 6.-Wheres Mary? -Oh, she _the library.A.has gone to B.went to C.has been to D.had gone to 一、单项选择一、单项选择1、Both his parents look
13、sad .Maybe they _whats happened to him . knew . have known . must know .will know2、He has _ been to Shanghai , has he ?. already .never .ever . still3、Have you met Mr Li _？. just . ago .before . a moment ago4、The famous writer _ one new book in the past two year . is writing .was writing .wrote .has
14、 written 5、-Our country _ a lot so far .-Yes . I hope it will be even _ . . has changed ; well . changed ; good . has changed ; better . changed ; better 6、Zhao Lan _already _in this school for two years . was ; studying . will ; study . has ; studied . are ; studying7、We _ Xiao Li since she was a l
15、ittle girl . . know . had known . have known . knew 8、Harry Potter is a very nice film .I_ it twice . will see . have seen . saw .see9、-These farmers have been to the United States .-Really ? When _ there ?. will they go . did they go. do they go . have they gone10、-_ you _ your homework yet ?-Yes . I _
