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1、 I have known her for six years.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, 或者发生在过去却对现在造成的影响学.科.网zxxk.组卷网I knew Miss Chen in 2008.一般过去时表示的是纯粹在过去发生的事情现在完成时现在完成时have/ has +have/ has +过去分词过去分词 过去分词的构成过去分词的构成1. 直接加-ed。如：play-played2. 以字母e结尾的直接加d 。如：name-named3. 以辅音字母加y结尾的，变y为i加ed 。如：carry-carried4. 重读闭音节且末尾只有一个辅音字
2、母，双写这个辅音字母再加-ed。如：stop-stopped学.科.网zxxk. 巧记不规则动词过去式1. 中间去e末尾加t。 如：keep kept， feel felt， sleep slept，sweep swept 2. 结尾d变t。 如：build built，lend lent，send sent，spend spent 3. 遇见i改为a。 如：ring rang，sit sat， drink drank，sing sang，swim swam，begin began，give gave 4.“骑(马)”“开(车)”“写(字)”把i变o。如：ride rode，drive dro
3、ve，write wrote5.“想”“买”“带来”“打仗”ought换上 如：think thought，buy bought， bring brought，fight fought 6.“教书”“抓住”aught切莫忘 如：teach taught，carry caught 7. ow/aw改为ew是新时尚如：know knew，grow grew， throw threw，draw drew 8. “放”“让”“读”过去式与原形一样。 如：put put，let let，read read学.科.网 巧记不规则动词过去式1) 表示到现在为止已经完成或刚刚完成的动作。Now we have
4、 planted all the trees.He has just come back. They have built many buildings in this city. 现在完成时的用法2) 表示过去发生的动作,强调结果或对现在的影响。Someone has broken the window. (窗户现在是坏的)I have already lost the key. (我现在没有钥匙)I havent read that book yet . (不了解书的内容)I have just cleaned my hands. (手是干净的)常与already(已经), yet(已经)
5、, just(刚刚),ever(曾经)等词连用. already: 常用于肯定句中.yet: 常用于否定句,疑问句尾. 在以上两种用法中常跟already, notyet, never, just, before, ever, recently等时间继续下去的状语。3) 表示过去已经开始, 持续到现在, 也许还会继续下去的动作或状态，常与包括现在在内的一段时间的状 语连用。She has learned English for 5 years. He has lived in Beijing since he was born .Has he lived in Shenzhen for 4 y
6、ears? 常与for, since引导的时间短语或从句连用.for+ 时间段since+时间点 , since+ 句子since 用来说明动作起始时间 “自从”for用来说明动作延续时间长度 “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since和for注意：并非有for 作为时间状语的
7、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。)（for+表示一段时间的词组，since+表示过去某一时刻的词或词组）谓语只可用延续性动词. eg.- Ive lived here for 15 years.eg.- Ive lived here since 15 years ago(1990)选用for和since填空:1. We havent seen each other _ a long time.2. His f
8、ather 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 China.5. His grandparents have been dead _ several years.6. Its five years _ we met last time.（for+表示一段时间的词组，since+表示过去某一时刻的词或词组）谓语只可用延续性动词. eg.- Ive lived here for 15 years.eg.
9、- Ive lived here since 15 years ago(1990)选用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 China.5.His grandparents have been dead _ several years.6. Its five years _
10、 we met last timefor since forsince for sinceI have eaten breakfast.She has eaten breakfast.He has eaten breakfast.肯定句They have eaten breakfast.把下列句子改为否定句 Ive already had dinner. I _ _ dinner _. 2. He has just finished his homework. He _ _ his homework _. 3. Mums cooked the dinner. Mum _ _ the dinne
11、r.1. Ive already had dinner.I _ _ dinner _.2. He has just finished his homework.He _ _ his homework _.3. Mums cooked the dinner.Mum _ _ the dinner.haventhadyethasnt finishedyethasnt cooked把下列句子改为否定句I have not (havent) seen the film. She has not (hasnt) seen the film.现在完成时的否定形式： have not (havent) +过去
12、分词 has not (hasnt) +过去分词 I havent eaten supper. eat-eaten He hasnt changed his idea. change-changed My mother hasnt come back home. come-come否定句1. Ive already had dinner.2. He has just finished his homework.3. Mums cooked the dinner.把下列句子改为一般疑问句1. Ive already had dinner.2. He has just finished his h
13、omework.3. Mums cooked the dinner.Have you had dinner yet?Has he just finished his homework?Has mum cooked the dinner? 把下列句子改为一般疑问句Have you eaten your breakfast?现在完成时的一般疑问句形式Have/has 提前+过去分词 Have you known Sandy for a long time? Yes, I have/ No, I havent. know-knownHas she eaten anything since 9:00
14、a.m. Yes, she has/ No, she hasnt. eat-eaten疑问句I have bought a new dress.I bought a new dress three days ago.I _ _ a new dress for three days.have had注意: 瞬间动词不能和时间段连用. 瞬间动词joinbegin/startborrowfinish/endarrive/comeleavediebuymethod 1: 动作 状态diebe overleaveborrow/buyarrivebeginend/finishjoinmarrykeep/h
15、adbe awaybe herebe on(上演）be marriedbe in be dead1.他的爷爷已经去世2年了。 1.2. 他离开深圳好长时间了。2. 3. 这本书我已借了4个月了. His grandpa has been dead for 2 years. He has been away from Shenzhen for a long time. I have kept the book for 4 months. Examples:method 2: It is + 时间段 since + 一般过去时的句子.他的爷爷已经去世2年了 。= It is 2 years since his grandpa died. His grandpa has been dead for 2 years. He has gone to Shanghai.他(已经)去上海了。He has been to Shan
