初中現(xiàn)在完成時(shí)講解ppt

1、現(xiàn)在完成時(shí),現(xiàn)在完成時(shí): have/ has +過去分詞 1) 表示到現(xiàn)在為止已經(jīng)完成或剛剛完成的動(dòng)作。 Now we have planted all the trees. He has just come back.,2) 表示過去發(fā)生的動(dòng)作, 但強(qiáng)調(diào)結(jié)果或?qū)ΜF(xiàn)在的影響。 Have you had your supper? I have read the book twice already. 在以上兩種用法中常跟already, notyet, never, just, before, ever, recently等時(shí)間繼續(xù)下去的狀語。,3) 表示過去已經(jīng)開始, 持續(xù)到現(xiàn)在, 也許還會繼

2、續(xù)下去的動(dòng)作或狀態(tài)，常與包括現(xiàn)在在內(nèi)的一段時(shí)間的狀語連用。 He has studied English for 6 years. Mary has been busy since she came back from Hangzhou.,過去分詞的構(gòu)成,1.直接加-ed。如：play-played 2.以字母e結(jié)尾的直接加d 。如：name-named 3.以輔音字母加y結(jié)尾的，變y為i加ed。如：carry-carried 4.重讀閉音節(jié)且末尾只有一個(gè)輔音字母，雙寫這個(gè)輔音字母再加-ed。如：stop-stopped,現(xiàn)在完成時(shí) Present perfect 句型,1.肯定句 現(xiàn)在完成時(shí)

3、的肯定句式是“have（has）過去分詞”。 注意：該句式中的have或has是助動(dòng)詞，has用于第三人稱單數(shù)，其它人稱一律用have。 2.疑問句 現(xiàn)在完成時(shí)的一般疑問句式是把助動(dòng)詞have或has提到主語之前。 （回答用“Yes，have（has）“No，havent（hasnt）” ） 3.否定句：現(xiàn)在完成時(shí)的否定句式是“havent（hasnt）過去分詞”。,I have eaten my lunch.,She has eaten her lunch.,He has eaten his lunch.,肯定句,They have eaten their lunch.,I have not

4、 (havent) seen the film.,She has not (hasnt) seen the film.,現(xiàn)在完成時(shí)的否定形式： have not (havent) +過去分詞 has not (hasnt) +過去分詞,I havent eaten supper. eat-eaten He hasnt changed his idea. change-changed My mother hasnt come back home. come-come,否定句,Ive already had dinner. I _ _ dinner _. 2. He has just finish

5、ed his homework. He _ _ his homework _. 3. Mums cooked the dinner. Mum _ _ the dinner. 4. Susans learned English at school. Susan _ _ English at school.,havent,had,yet,hasnt,finished,yet,hasnt cooked,hasnt,learned,把下列句子改為否定句,Have you eaten your breakfast?,現(xiàn)在完成時(shí)的一般疑問句形式 Have/has 提前+過去分詞,Have you know

6、n Sandy for a long time? Yes, I have/ No, I havent. know-known Has she eaten anything since 9:00 a.m. Yes, she has/ No, she hasnt. eat-eaten,疑問句,Ive already had dinner. 2. He has just finished his homework. 3. Mums cooked the dinner. 4. Susans learned English at school.,Have you already had dinner?,

7、Has he just finished his homework?,Has mum cooked the dinner?,Has Susan learned English at school?,把下列句子改為一般疑問句,分清與一般過去時(shí)的用法 現(xiàn)在完成時(shí)屬于現(xiàn)在時(shí)態(tài)的范圍，不能和表示過去的時(shí)間狀語連用，如yesterday,last night,three weeks ago,in1990等.而一般過去時(shí)只表示過去的動(dòng)作或狀態(tài)，和現(xiàn)在不發(fā)生關(guān)系。 eg- I have seen the film. eg- I saw the film last week. eg- He has lived

8、 here since 1993. eg- He lived here in 1993.,Notes: 1) have gone to 與have been to have gone to表示某人已離開了原地，去了另外某地，說話時(shí)，人已不在原地。后者表示某人曾 have been to去過某地，說話時(shí)人已不在某地了。 He has been to Xian twice. 他曾經(jīng)去過西安兩次。（已經(jīng)回來了） You cant find him. He has gone to Xian. 你找不到他。他去西安了。（沒回來）,動(dòng)詞填空： 1._ you _(clean) the room? Yes,

9、 we_(do) that already. When _ you _(do) it? We _(do) it an hour ago. 2._ he _(see) this film yet? Yes. When _ he _(see) it? He _ it last week. 3. How many times _you_(come) here? Once.,Have,cleaned,have done,did,do,did,Has,seen,did,see,saw,have,come,4. I _ (read) the novel twice. Its interesting. 5.

10、 She _(go) to Pairs, hasnt she? Yes. How _ she _(go) there? She _(go) there by air. 6. So far, many countries _(develop) their software programs. 7.Mr Chen _(give)up smoking last year. 8._ you ever _(ride) a horse? Never. 9.He _( keep) the book since two days ago.,have read,has gone,did,go,went,have

11、 developed,gave,Have,ridden,has kept,Ive already had dinner. 2. He has just finished his homework. 3. Mums cooked the dinner. . 4. Susans learned English at school.,What have you already done?,What has he just done?,Who has cooked the dinner?,Where has Susan learned English?,對劃線部分提問,（for+表示一段時(shí)間的詞組，s

12、ince+表示過去某一時(shí)刻的詞或詞組）謂語只可用延續(xù)性動(dòng)詞.,eg.- Ive lived here for 15 years. eg.- Ive lived here since 15 years ago(1990),選用for和since填空: 1.We havent seen each other _ a long time. 2.His father has been in the factory _ 10 years ago. 3.The film has been on _ 20 minutes. 4.Mr Green has worked here _ he came to Ch

13、ina. 5.His grandparents have been dead _ several years. 6. Its five years _ we met last time,for,since,for,since,for,since,練習(xí)題: 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