现在完成时专题讲解与练习
现在完成时态讲解及练习1、概念：表示某个动作或状态发生在过去，但对现在造成了影响，这个动作或状态也可能已经结束，也可能还要继续下去。
2、现在完成时态的构成：助动词have / has +动词的过去分词.当主语为第三人称单数用has,其余人称用have。
否定句在助动词have/ has 后加not ；疑问句则把助动词Have/ Has 提放到主语之前。
如：I have worked here for ten years . She hasn't been to the Great Wall . Have you been to Beijing ?3、现在完成时态的用法（1）、表示过去某时刻发生的动作对现在造成的影响或结果，常与already, yet, just , ever, never…..before, this morning, now , today , so far , in the last/ past+时间段、over +时间段, recently，by+现在时间等连用如：Tom has already finished his homework.We have had two classes this morning.（2）、表示从过去某一时刻开始，一直延续到现在的动作或状态，常与for 引导的一段时间或since 引导的时间点或过去时间状语从句连用。
如：Mr Green has lived in China for five months.Mr Green has lived in China since five months ago.Mr Green has lived in China since he came to China.4、have/ has been to 与have/ has gone to 区别（1）、have/ has been to 表曾去过某地（现在已不在该地），其后可接表次数的时间名词。
如：Have they been to E'mei Mountain?（2）、have/ has gone to 表示去某地了（现在不在说话的现场），其后不能用任何时间名词。
如：Where is Jim ? He has gone to the library.（3）、have/ has been in /at表曾在某地住过、停留过，其后常跟for 或since 引导的时间状语。
如：I have been at that village for ten years.5、短暂性动词与延续性动词在完成时态中的运用（1）、在肯定句中，不能和for,since引导的时间状语连用，也不能用在how long引起的特殊疑问句中。
(2). 凡是"完成时态"都表示，不知道也不管动作发生的具体时间, 所以在使用现在完成时的句子里，不可以带有表示具体过去时间的状语，如：yesterday , last week ( month , year , etc. ) , two weeks ago , in 1999等；但常和有些副词连用，如：just , before , already , often , never , ever , not…yet , always等等。
(3). 在以when提问的特殊疑问中不能用现在完成时。
另外，ago不能用于现在完成时的句子里，因为它表示从现在算起的以前某个时间，属于表示具体过去时间的状语。
但是可以用before 来表示"以前"的意义，因为它只表示"以前"，而不知什么时候的以前。
（4）、大部分短暂性动词可以根据实际情况改为相应的延续性动词来表达相同或相近的意思，常用的列举如下：borrow /lend→keep buy →haveleave →be away( from) die →be deadjoin →be in / be a member of begin →be oncome →be / live / staycatch a cold →have a coldget up / wake up →be upgo to school →be at school get/ receive (接收）→havehear from →have a letter from go / come / arrive /get(到达)/reach →be(in/at)finish →be over(5)、句型1：It is / has been +时间段+since +句子（过去时态）It is five years since he came to China.【注意】一般过去时与现在完成时的区别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；一般过去时常与具体的时间状语连用。
试比较：I saw this film yesterday.（强调看的动作发生过了，不涉及现在）I have seen this film. （强调对现在的影响，电影的内容已经知道了。
）动词不规则变化分类记忆表一、ABB型（过去分词与过去式一样）sleep ---slept sweep –swept keep –kept burn ---burntmean –meant bring—brought fight –fought buy –boughtteach –taught think –thought catch—caught lend –lentbuild ---built send –sent spend –spent find –foundhold ---held feel ---felt smell –smelt meet –metget –got sit –sat leave –left lose ---lost sell—sold tell ----told say ---said stand ----stoodwin ---won understand –understood make ---made二、ABC型（过去分词= 动词原形+n / en ）blow –blew ---blown grow ---grew –grown know ---knew –known throw-threw ---thrown draw ---drew –drawn show ---showed ---shown drive--drove ---driven rise –rose ---risen give ---gave ---given see ---saw ---seen take --took ----takenmistake --mistook--mistaken eat ---ate ---eaten beat –beat ---beaten fall--fell --fallen ride --rode--riden write --wrote ---writen三、ABC型（过去分词=过去式+n）break--broke--broken choose--chose--chosen speak ---spoke ---spoken四、ABC型（动词原形、过去式、过去分词的元音字母呈i---a----u 变化）begin-began -begun drink ---drank ---drunk ring ---rang –rung 五、ABC型（原形、过去式、过去分词各不一样）am/ is --was ---been are -were --been fly ----flew---flown lie ---lay ----lain do ---did ---done go ---went ---gone wear ---wore ---worn六、ABA型（过去分词与原形一样）become -became -become come -came --come run ----ran ----run七、AAA型cut hit hurt let put read八、ABB型（两种形式）hang ---hung / hanged --hung / hangedlearn --learned / learnt --learned / learntshine --shone / shined --shone / shinedsmell --smelt / smelled --smelt /smelled现在完成时态练习点段动词选择题1\The train _____for a long time .A.has been awayB. has leftC.left2\My brother _____for a week.A. has had a coldB. caught a coldC. has caught a cold3\--Where is Jim? --He ___the library.A.has gone toB. has been toC. went4\They ___friends since they met in Shanghai.A. have madeB. have becomeC. have been5、Tom's brother ____for three years .A.has joined the armyB. has been in the armyC.became a solider 6\Mr Brown ____the car for three months .A. boughtB. has hadC. has bought7\How long have you ____here?A. beenB. goneC. arrived8\Our maths teacher has ___Australia for a week.A. gone toB. been inC. been to9\Her grandma has ____ for three years.A. diedB. been deadC. dead10\The film has ____for half an hour.A. begunB. beganC. been on11\I'll lend you mu dictionary,but you can only ____it for one day.A. keepB. borrowC. lend12\It has rained ____three days ago.A. sinceB. forC. /13\I won't go to see the film because I _____it twice.A. seeB. sawC. have seen14\The factory has been here since it ______.A. opensB. openedC. open15\He's never been to the Great Wall ,_____?A. isn't heB. hasn't heC. has he16\Tom has visited his uncle_____.A. yesterdayB. tomorrowC. today17\I haven't had lunch _____.A. alreadyB. yetC. still18\____has he stayed in that city? ˉFor two weeks.A. How longB.WhenC. How often19\---I have seen the film "Titannic" already .---When ____you ____it ?A. have , seenB. did , seeC. did , seen20.I have ____finished my homework ,but Tom hasn't finished his ____.A. already, alreadyB. yet, alreadyC. alreday,yet21\What _____the forest of the USA in the last 350 years ?A. has happened toB. is happened toC. has happened at22. ----How long ____you ____the library book ?A. did , borrowB. have, borrowedC. have , kept23. How many English words _____you _____ by now ?A. did, learnB. have, learnedC. is , learning24.He hasn't Quanzhou ever since he left schoolA. leftB. been awayC. beenD. away一、单项选择1\Both his parents look sad .Maybe they_____what's happened to him .Ａ. knew Ｂ. have known Ｃ. must know Ｄ.will know 2\He has____been to Shanghai , has he ?Ａ.already Ｂ.never Ｃ.ever Ｄ.still3、Have you met Mr Li ______？Ａ.just Ｂ.ago Ｃ.before Ｄ.a moment ago4、The famous writer _____ one new book in the past two yearＡ. is writing Ｂ.was writing Ｃ.wrote Ｄ.has writ ten5\-Our country ______ a lot so far .-Yes . I hope it will be even ______ .Ａ. has changed ; well Ｂ. changed ; goodＣ. has changed ; better Ｄ. changed ; better6、Zhao Lan ______already ______in this school for two years .Ａ.was ; studying Ｂ.will ; study Ｃ.has ; studied Ｄ.are ; st udying7、We ______ Xiao Li since she was a little girl .Ａ. know Ｂ. had known Ｃ. have known Ｄ. knew 8、Harry Potter is a very nice film .I____it twice .Ａ.will see Ｂ.have seen Ｃ.saw Ｄ.see9\-These farmers have been to the United States.-Really ? When __there ?Ａ.will they go Ｂ.did they go Ｃ.do they go Ｄ.have they go ne10\-______ you ___ your homework yet ? -Yes . I _____ it a moment ago .Ａ. Did ; do ; finished Ｂ. Have ; done ; finishedＣ. Have ; done ; have finished Ｄ. will ; do ; finish11\ His father ______ the Party since 1978 .Ａ. joined Ｂ. has joined Ｃ. was in Ｄ.has been in12\-Do you know him well ? - Sure .We _________ friends since ten years ago .Ａ. were Ｂ. have been Ｃ. have become Ｄ. have made13\-How long have you ____ here ? -About two months .Ａ. been Ｂ. gone Ｃ. come Ｄ. arrived14\Hurry up! The play __________ for ten minutes .Ａ. has begun Ｂ. had begun Ｃ.has been onＤ. began15\ It ___ten years since he left the army .Ａ. is Ｂ.has Ｃ.will Ｄ.was16\ Miss Green isn't in the office . she_______to the library .Ａ.has gone Ｂ. went Ｃ.will go Ｄ. has been17\My parents ______ Shandong for ten years .Ａ.have been in Ｂ.have been to Ｃ.have gone to Ｄ.have been 18\The students have cleaned the classroom, ?A. so theyB. don't theyC. have theyD. haven't they19\Mr Green isn't in the office , He to the library.A has goneB wentC has beenD will go20\.She's never been to England, she?A hasB hasn'tC isn'tD is21\_____has Hanmei been in the library.A How longB How soonC How farD How often二、用since和for填空1) ______ two years 2) _______ two years ago 3) _______ last month4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock7) ______ 4 hours 8) _______ an hour ago 9)______we were children10) _____ lunch time 11) ______ she left here三、用have(has) been 或have(has) gone 填空。
现在完成时讲解(含讲解及习题)
现在完成时讲解一、构成:肯定式：主语+ 助动词have/has + 动词的过去分词.疑问式：助动词Have/Has + 主语+ 动词的过去分词?否定式: 主语+ 助动词have/has + not + 动词的过去分词.过去分词规则变化：a)一般情况下，直接加ed, （work---worked，water---watered, finish---finished等;）b)以“辅音字母+ y”结尾的动词, 把y 变成i 再加ed, （carry---carried study---studied等;）c)以辅+元+辅结尾且中读的动词，要双写最后一个辅音字母，再加ed。
（stop---stopped，shop---shopped）d)以不发音的e结尾的动词，只加d （过去分词不规则变化表：二、用法：用法一：表示过去（已经、曾经或从未）发生的某一动作对现在造成的影响或结果。
标志词：①already, ②never, ③ever, ④just, ⑤yet, ⑥before,⑦once/twice/数字+ times例：I have cleaned my room. 我已打扫了房间(房间现在是干净的，不需要打扫了)They have left. --他们已经离开了,也就是说现在他们人不在这里I have never had a car (我从未有过汽车。
)I have been there twice.a）already 往往用于肯定句，用在疑问句时表示强调或加强语气；yet 用于否定句和疑问句。
•He has already left here. 他已经离开这里了。
•Has he already left here? 他（真的）已经离开这里了吗？（表示加强语气）•My teachers haven’t had breakfast yet. 我的老师们还没有吃早饭。
•Have you written to your parents yet? 你已经给你父母写过信了吗？b）never 是否定词，表示“从来没有”，而ever 表示“曾经”•We have never been to the Great Wall. 我们从来没有去过长城。
现在完成时态讲解和练习
现在完成时态讲解及练习一、现在完成时的构成肯定句：主语+have/ has + done (过去分词)+其它He has lived in Shenzhen for 4 years.一般疑问句：Have/ Has +主语+ done (过去分词)+其它Has he lived in Shenzhen for 4 years?否认句: 主语+have/ has+ not + done (过去分词)+其它He has not finished his homework.过去分词的构成方法如下 :1.一般情况下，直接在动词原形后面加 –ed.work---worked answer---answered obey---obeyed want---wanted 2.以不发音的 -e 结尾的动词只加 –d.Move---moved hope---hoped divide---divided 3.字尾是辅音+y 的动词。
那么将y 改i 加ed. study---studied tidy---tidied satisfy---satisfied4.以重读闭音节结尾的词，这些词的末尾只有一个辅音字母时，双写这个辅音字母，再加 –ed. stop---stopped regret--- regretted drop---dropped不规那么动词过去式与过去分词分类记忆表一、AAA. 〔原形，过去式和过去分词一致〕二、ABB 〔过去式和过去分词一致〕3) 过去式、过去分词-t 替换原形-d6） 过去式、过去分词改为-elt二、现在完成时标志词：recently; recent years; these days/ years; lately; since; for+时间段；in the past few years; ever since; in the last five months; up to now; since then; so far; ever; never, yet; once; twice; already; before; just already (已经): 用于肯定句I have already posted the letter .yet(已经): 用于否认句,疑问句He hasn’t done his homework yet.just(刚刚)They have just left.ever(曾经)Have you ever been to Beijing ?never(从不)I have never seen him .before(以前)Have you seen the film before?since(自从…以来)I’ve worked in the school si nce 1999.for(长达)He’s lived in Shenzhen for 6 years.in the past several days / weeks/ years(在过去的…)recently(最近)I have not written to my parents recently.so far(到目前为止)So far she has learned 5 English songs.up to now(到目前为止)this morning/month/year(今天早上/这个月/今年)三、现在完成时的用法1)现在完成时表示过去发生的动作,并对现在有影响。
现在完成时专项讲解与练习
一、选择题1、He has _______ been to Shanghai , has he ?A. alreadyB. neverC. everD. still考查知识点：现在完成时态中时间副词的使用。
反意疑问句前面跟后面得一肯一否。
疑难点：时间副词所适用的情况解析：该already一般用于肯定句中，用于疑问句中表示惊讶的语气；never用于否定句中；ever用于疑问句中；still强调过去发生的事情及存在的状况目前还在延续。
在现在完成时的否定句中，still表示吃惊或不耐烦的语气。
题考查完成时态时间副词的使用和反意疑问句，句子后面是has he，说明前面表示的是否定意义。
答案：B。
2、Harry Potter is a very nice film. I ______ it twice.A. will seeB. have seenC. sawD. see考查知识点：时态的判断疑难点：现在完成时和一般过去时的区别解析：该题题意是哈利波特是一部很好的电影，我已经看过两次了。
这里说的看过两次对现在有影响，因为看过才知道这部电影好。
所以我们可以推断用现在完成时，表示动作发生在过去对现在的影响。
答案：B。
3、His father ______ the Party since 1978 .A. joinedB. has joinedC. was inD. has been in考查知识点：时态的判断，瞬间动词转换成延续性动词。
疑难点：瞬间动词不能与表示持续时间段的时间状语连用，用在现在完成时态中与时间段连用需要作相应的变形。
解析：通过since 1978这个时间状语我们可以初步判断用现在完成时，所以排除A、C, 由于join 是瞬间动词，不能与时间段连用，得作相应的变形。
意为我父亲自从1978年就入党。
表示一种状态，join 得变成been in。
所以排除B。
答案：D。
4、—Do you know him well ?— Sure .We _________ friends since ten years ago.A. wereB. have beenC. have becomeD. have made考查知识点：瞬间动词跟延续性动词的变形。
现在完成时讲解及练习
现在完成时讲解及练习1. 什么是现在完成时现在完成时是英语中的一种时态，用于描述过去发生的动作对现在造成的影响或结果。
它通常由助动词 "have" 或 "has" 和动词的过去分词构成。
现在完成时常用于以下情况：- 表示过去某个时间内发生的动作，并与现在有关的时刻、时间段或状况有关联。
- 表示过去开始的动作一直持续到现在，并可能继续发生下去。
- 表示过去的经历或经验对现在产生的影响。
2. 现在完成时的构成现在完成时的基本结构由助动词 "have" 或 "has" 和动词的过去分词构成。
下面是构成现在完成时的规则：- 如果主语是第一人称单数（I），则使用 "have"。
- 如果主语是第三人称单数（he/she/it），则使用 "has"。
- 其他所有人称（一般为复数形式）使用 "have"。
动词的过去分词形式主要有三种：- 以 "-ed" 结尾的动词，如 "worked"。
- 不规则动词过去分词，如 "gone"。
- 部分动词过去分词与原形一样，如 "put"。
3. 现在完成时的使用示例表示过去某个时间内的动作- I have traveled to many countries.（我去过很多国家。
）- She has read five books this month.（她这个月读了五本书。
）表示持续到现在的动作- They have lived in this city since 2005.（他们从2005年开始就一直住在这个城市。
）表示过去的经历对现在的影响- I have studied English for many years, so now I can speak it fluently.（我学了很多年英语，所以现在我能够流利地说它。
现在完成时讲解(附习题+答案)
现在完成时讲解（附习题+答案）定义：表示动作从某一时间开始，一直持续到现在，或者刚刚终止，或者可能仍然要继续下去。
1.发生于过去，和现在有关。
例如：He has lost his book.他丢了他的书。
（所以他到现在一直没书）2.开始于过去，持续到现在。
例如：He has taught in our school for 30 years.他在我们学校教书已有30年了。
（现在还在教）3.从过去到现在不断反复的动作或情况，且不断重复可能继续下去，也可能到现在结束。
例如：My father has always gone to work by bike.我父亲一向骑车上班。
（从过去到现在期间一直这样）4.同一般现在时可以表示将来一样，现在完成时也可以在时间状语从句里表示将来。
例如：I'll wait until he has written his letter.我愿等到他把信写完。
构成：主语+ have / has + done（过去分词）+ …肯定句: 主语+ have / has + 过去分词+ …She has been to Shanghai.她去过上海.I have finished doing my homework.我已经完成我的作业了.否定句: 主语+ have / has + not +过去分词+ …I haven’t seen this film.我没有看过这部电影.She hasn’t finished doing his homework.她还没有完成她的作业.一般疑问句：Have / Has + 主语+ 过去分词+ …Have you seen this film ?Yes, I have. / No, I haven’t .你看过这部电影吗?是的, 看过. / 不, 没有.Has she finished doing his homework ?Yes, she has . / No, she hasn’t.她完成她的作业了吗?是的, 完成了. / 不, 没有.特殊疑问句：特殊疑问词+ have / has + 主语+ 过去分词+ …Who has finished doing his homework ?谁完成了作业?注意：has gone to, has been to, has been in/on 的区别(1)have/ has been to 表示：曾经去过某地（已经回来了），常用于第三人称，可与once, never, several times等连用(2)have/ has gone to 表示：去了某地（还没有回来）They have been to Shanghai twice.他们去过上海两次。
（完整版）现在完成时讲解及练习题及答案
（完整版）现在完成时讲解及练习题及答案时态讲解：现在完成时（1）构成：现在完成时由助动词have + 过去分词构成，助动词have 有⼈称和数的变化。
第三⼈称单数⽤has，其余⽤have.现在完成时的否定式直接在助动词后⾯加上not、疑问式是把助动词提到主语之前。
以study 为例，其否定式、疑问式和简单回答形式如下：（2）⽤法：1）现在完成时通常表⽰在说话之前已经完成的动作或存在的状态。
说话⼈强调的是该动作或状态对现在的结果或影响。
My daughter has just gone out. 我⼥⼉刚出去。
I’m sure we’ve met before. 我肯定我们以前见过⾯。
She has arrived. 她到了。
2）表⽰持续到现在的动作或状态，往往和包括现在在内的表⽰⼀段时间的状语连⽤，如recently, already, just, lately, for…, since…,yet等。
如：I haven’t heard from her these days. 这些⽇⼦我没有收到她的信。
We haven’t seen you recently. 最近我们没有见到你。
They have been away for two years. 他们离开已经两年了。
She has been with us since Monday.★注意：1）since和for的区别since后接时间点，如1993，last term, yesterday, the time I got therefor后接⼀段时间，表⽰“长达多久”，如ten years, a while, two days等。
Exercise: ⽤since和for填空1. Jim has been in Ireland ______ Monday.2. Jill has been in Ireland ______ three days.3. His aunt has lived in Australia ______15 days.4. Mary is in her office. She has been there ______ 7 o'clock.5. India has been an independent country ______1974.6. The bus is late. They've been waiting ______ 20 minutes.7. Nobody lives in those houses. They have been empty ______ many years.8. Mike has been ill ______a long time. He has been in hospital ______ October.2）表⽰短暂意义的动词如arrive, leave, borrow, buy, begin, start, die等，在完成时当中不能和表⽰⼀段时间的状语连⽤，因为它们表⽰的动作不可能持续。
现在完成时精讲以及练习(附答案)
现在完成时精讲和练习（附答案）一、现在完成时的六种常用情景：（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，1、The car has arrived。
车子来了。
（对现在结果的影响是：车子已在门口）2、Someone has broken the window.有人把窗户打破了。
（对现在结果的影响是：窗户仍破着）3、It’s so dark。
Someone has turned off the light.这里很黑，有人刚把灯关了。
（对现在结果的影响是：现在很黑）4、Are you free? I have finished my homework. I am free.你有空吗？我已经做完了家庭作业。
我有空。
（我已经完成了家庭作业,对现在影响是：很有空）。
（二）表示过去已经开始，一直延续到现在的动作或状态。
一般会和表示从过去某一时刻延续到现在（包括“现在”在内）的一段时间的状语连用。
如for+时间段、since+过去的时间点、疑问词how long等。
这时表示持续动作或状态的动词必须是延续性动词。
1、My uncle has worked at this factory for five years。
我叔叔在这个工厂工作已经五年了。
2、Mr. Black has lived in China since 2002。
自从2002年Mr. Black 一直住在中国。
3、How long have you been here?你来这里多久了？4、I have learnt English for more than ten years。
我已经学了10多年的英语。
(从10年前开始,持续到现在)5、She has swum since half an hour ago。
我已经游泳了半个小时。
(半个小时前开始，到现在还在游) （三）经验性用法：表示从过去开始到目前为止这段时间中反复发生的动作或多次出现的状态。
现在完成时的讲解和练习（5篇材料）
现在完成时的讲解和练习（5篇材料）第一篇：现在完成时的讲解和练习现在完成时讲解和练习现在完成时讲解一．基本结构：助动词have/has+过去分词(done)二．句型：否定句：主语+have/has+not+过去分词+其他.一般疑问句：Have/Has+主语+过去分词+其他.简略答语: Yes, 主语 + have/has.(肯定)No, 主语 + haven't/hasn't.(否定)三．用法（1）现在完成时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I have spent all of my money(so far).(含义是:现在我没有钱花了.)Guo zijun has(just/already)come.(含义：郭子君现在在这儿)My father has gone to work.(含义是:我爸爸现在不在这儿)（2）现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作（用行为动词表示）或状态（be动词表示）常与for（+时间段）,since（+时间点或过去时的句子）连用.①for+时段②since+过去一个时间点（译为：自从……以来）③since+时段+ago④since+从句（过去时）●⑤It is+时段+since+从句（过去时）Mary has been ill for three days.I have lived here since 1998.四． has gone(to),has been(to), has been(in)的区别Have/Has gone(to):去了(现在不在说话现场)Where is your father？He has gone to Shanghai.Have/Has been(to):去过（已不在去过的地方）My father has been to Shanghai.Have/has been in：呆了多久（还在所呆的地方）My father has been in Shanghai for two months./since twomonths ago.五．现在完成时的标志1.现在完成时的含义之一是过去完成的动作对现在仍有影响,用以下四大标志词可以表达这种含义:* 以already, just和yet为标志He has already got her help.他已得到她的帮助。
现在完成时专项讲解及练习
时态专题之现在完成时第一部分：现在完成时概述现在完成时的结构：现在完成时的结构是“ have / has+ 动词的过去分词”。
过去分词的变化分规则与不规则两种。
规则变化与过去式相同，不规则变化需要另记。
现在完成时的用法：1）过去发生或已经完成的动作或存在的状态对现在造成的影响或结果。
（即它的＂完成用法＂）e.g. I have just cleaned the classroom.2)过去已经开始，一直持续到现在的动作或状态。
注意：此时动作可能还要继续。
（即它的＂未完成用法＂）。
E.g. He has lived in Beijing for ten years.现在完成时的句型变换A. 现在完成时的否定句是在have / has后边加not，变一般疑问句是把have / has提前。
E.g. I have ridden a horse.I have not ridden a horse.Have you ridden a horse?B.现在完成时的时间状语通常为already, just, yet, ever, never, before等。
另外还可和since+表过去的时间点，for+时间段连用。
做题时常见错误如下：一、易丢掉have / has例：He taken (take) the medicine before.Correction：________________解析：have/has 为助动词，起构成时态的作用，是不能省略的。
二、have与has易用混例：I has never heard (hear) of that before.Correction：________________解析：现在完成时与一般现在时一样也有单三人称的变化，当单三人称作主语时用has, 一般人称作主语时用have．三、延续性动词与短暂性动词易弄错例：She has left (离开) for 2 hours.Correction：________________解析：在肯定句中，与since或for引出的时间状语连用的是延续性动词，不能是短暂性动词，但在否定句中短暂性动词也是可以的。
现在完成时态讲解及练习
现在完成时态讲解及练习现在完成时态讲解及练习1、概念：表示某个动作或状态发生在过去，但对现在造成了影响，这个动作或状态也可能已经结束，也可能还要继续下去。
2、现在完成时态的构成：助动词have / has +动词的过去分词。
当主语为第三人称单数用has,其余人称用have。
否定句在助动词have/ has 后加not ；疑问句则把助动词Have/ Has 提放到主语之前。
如：I have worked here for ten years . She hasn't been to the Great Wall . Have you been to Beijing ?3、现在完成时态的用法（1）、表示过去某时刻发生的动作对现在造成的影响或结果，常与already, yet, just , ever, never…..before, this morning, now , today , so far , in the last/ past+时间段、over +时间段, recently，by+现在时间等连用如：Tom has already finished his homework. We have had two classes this morning.（2）、表示从过去某一时刻开始，一直延续到现在的动作或状态，常与for 引导的一段时间或since 引导的时间点或过去时间状语从句连用。
如：Mr Green has lived in China for five months.Mr Green has lived in China since five months ago.Mr Green has lived in China since he came to China.4、have/ has been to 与 have/ has gone to 区别（1）、 have/ has been to 表曾去过某地（现在已不在该地），其后可接表次数的时间名词。