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1、还没现在完成时的讲解和练习对所学时态的回顾，引入现在完成时通过数轴来概括讲解所学的四个时态：一般现在时、现在进行时、一般过去时、一般将来时。（导入）有时候，这4种时态还不能满足我们表达的需要。比如：表示“某人过去曾经做过某事”或者“某人做某事多久”，以上五种时态就派不上用场了。这时，我们可以用一种新的时态现在完成时表示。同样也用数轴来表示一下。一 现在完成时的构成:主语 + have/has + 过去分词 (过去分词:规则动词的过去分词构成与动词过去式相同;不规则动词需要特殊记忆。略 )Exercises1 选择填空( )1.I Enghish in this school since 199
2、9(A)taught (B)have taught (C)tea (D)would teach( )2.Lilei the pen for five years(A)has had (B)bought (C)have had (D)have bought( )3.Kate her grand mothers photo before(A)havent seen (B)have seen (C)see (D)hasnt seen( )4. Mary you these days.(A)Has,seen (B)Do,see (C)Did,see (D)Is,seeing( )5.so far ,w
3、e thousands of Building in Quanzhou(A)build (B)have build (C)build (D)will build二、否定式:主语 + havent/hasnt + 过去分词。 疑问式: Have /Has + 主语 + 过去分词?简略答语: Yes, 主语 + have/has.(肯定) No, 主语 + havent/hasnt.(否定)Exercises2 选择填空( )1.Have you finished your work? .(A).Yes,I have. (B)Yes,I do. (C)Yes,I am. (D)Yes,I did.
4、( )2.Has she ever learned English? (A)Yes, she has. (B)Yes, she does. (C)No, she doesnt (D)No, she has( )3.He finished his homework. yet(A)doesnt(B)havent (C)hasnt (D)doesnt have三 现在完成时的含义之一表示过去发生或已经完成的动作对现在造成的影响或结果，常与never/ever，just，already/yet，before。so far等连用。这些标志词可以表达这种含义以already, just和yet为标志 al
5、ready, just和yet 表示到现在为止动作或状态已经、刚刚或还没有发生。He has already got her help. He has just seen the film. He hasnt come back yet。以ever和never为标志 ever和never 表示到现在为止动作或状态曾经或从来没有发生过。 This is the best film I have ever seen. He has never been to Beijing. 以动作发生的次数为标志 若某一动作到现在为止已经发生了若干次,则要使用现在完成时。 He says he has been
6、 to the USA three times. 以so far为标志 so far往往表示到目前为止动作或状态已经发生。 He has got to Beijing so far. She has passed the examso far.never/ever，just，already/yet，before。so far的用法.1already意为“已经”，通常用于肯定句中，可放在助动词之后，过去分词之前，也可以放在句末。实例：1）Ive already read this book. 我已经读过这本书了。 （“读”这一动作发生在过去，对现在造成的影响是“知道书中的内容”。）2）Ive w
7、ashed my clothes already我已经洗了衣服。 （洗衣服的动作已完成，其结果是“衣服冼干净了”。）注意：在表示吃惊或明知故问等感情色彩时，already也可用于（口语）疑问句中。实例：3）Have you met him already ？你（真的）已经见过他了？2yet用在疑问句中意为“已经”，用在否定句中意为“还”，常放在句末。实例：1）Has he found his watch yet ？他已经找到他的手表了吗？ No，not yet不，还没有。2）The woman hasnt found her dog yet 那位妇女还没有找到她的狗。（没找到狗，心里着急，这就
8、是对现在的影响）3just意为“刚刚”，表示行为刚刚过去，常放在助动词与过去分词之间。实例： He has just come back from school 他刚从学校回来。4ever意为“曾经”，用于疑问句或否定句中，放在助动词与过去分词之间。实例： 1）Have you ever been to Hong Kong ？你曾去过香港吗？ 2）I havent ever spoken to her我未曾和她说过话。5never意为“从来没有”常与before连用（before要放在句尾，而never多放在助动词与过去分词之间。实例： I have never travelled by pl
9、ane before我以前从来没有乘飞机旅行过。6before意为“以前”，指过去不确定的某个时间，总是放在句末，不受句型的限制。实例： 1）Have you been to Hainan before ？你以前去过海南吗？ 2）I havent eaten Guangdong food before我以前没吃过广东菜。Exercises3 选择填空( )1.Have you travelled on the train. Yes, I have.(A)never (B)ever (C)just (D)yet( )2.Have you finished your homework Not .(
10、A)ever (B)already (C)yet (D)just( )3. We havent finished our homework .(A)already(B)ever (C)yet (D)never( )4.Have you learned English? Yes, Ive learned a lot.(A)never, ever(B)ever, never (C)ever, already (D)already. ever( )5.Have you finished your homework ? Yes, Ive done that (A)yet, already (B)alr
11、eady, yet (C)ever, never (D)still, just( )6.Johns father borrowed some pictures(A)have already (B)has just (C)have ever (D)has yet四、现在完成时含义之二表示过去已经开始,一直延续到现在的动作或状态。常与for, since, how long, these days等连用。Since+过去点的时间（since短语或从句表示过去的动作延续至今，since之后的时间为一点）Mr. Smith has worked here since 1984. Hes learned
12、 about 5,000 English words since he went to college. for+一段时间（数词+量词），（for短语表示动作延续多长时间，for的宾语为时间段）。此划线部分用how long提问。We have known each other for twenty years. I havent seen her for a long time. Exercises4 A）用since和for填空1) _ two years2) _ two years ago3) _ last month4) _ 19995) _ yesterday6) _ 4 ocloc
13、k7) _ 4 hours8) _ an hour ago9) _ we were children 10) _ lunch time11) _ she left hereB）用since和for填空1. He has lived in Nanjing _ the year before last.2. Ive known him _ we were children.3. Our teacher has studied Japanese _ three years.4. She has been away from the city _ about ten years.5. Its about ten years _ she left the city.C）选择填空( )1.Ive been like this ever snice (A)last week (B) for a week (C) a week before (D)the last week( )2.My mother has worked in this factory 2 years.(
