素材语法学习.pptx
past now Yesterday,we cleaned the classroom.Now,the classroom is clean because we have cleaned it.用法用法1强调强调过去发生的动作过去发生的动作对对现在产生的现在产生的结果或影结果或影响响 第1页/共31页1.My father bought many books for me yesterday.Now,I have a lot to read because _2.I saw this film last week.Now,I know this film because I_.3.I did my homework yesterday.Now,I can give it to the teacher because I_my father has bought many books for me.have seen it beforehave done it.第2页/共31页“仍然，还”用在疑问句和否定句中，放在句末。I havent read this book yet.Have you had breakfast yet?already:Yet:“已经”通常用于肯定句中,放在句中。I have already read this book.有时，也用在疑问句中表示惊讶。Have you eaten up all the food already?第3页/共31页“从来不”用在否定句中,放在句中。Is he famous?I have never heard of him.evernever“曾经”通常用于疑问句和肯定句中,放在句中。I have ever seen this film.Have you ever been to the USA?第4页/共31页“以前”用在完成时中，放在句末。have never read this kind of books before.justbefore“刚刚”用在陈述句中,放在句中。I have just bought a novel。第5页/共31页She began to work in 2005.She still works here now.She has worked at this school for 3 years.第6页/共31页now past I began to teach English at this school fiveyears ago.I have taught English at this school for five years.用法用法2 2：过去发生的动作一直过去发生的动作一直延续延续到现在。到现在。第7页/共31页1.I am a doctor.I began to work when I was 22.Now,I am 26.I _ for four years.2.We went to the USA last Monday.Today is Monday.We _ (stay)in the USA since last Monday.have workedhave stayed第8页/共31页since and forThe woman has worked at this school for 2 years.(since two years ago)since 2 years agosince 1998since she came to the school)for+for+时间段时间段since+since+时间点时间点for 2 years/a long time第9页/共31页一、用for和since填空。_three hours_three oclock_two days_yesterday afternoon_I came here_last Sunday_a week_a long time_1997 _two weeks_three years ago _ last monthforsinceforsincesincesinceforforsinceforsincesince第10页/共31页 1.Theyve known each other since_.A.1995 B.three years 2.Ive been interested in Chinese for_.A.last year B.one year 3.She has been a doctor for_.A.two years B.two years ago 4.Ive had a headache since_.A.I got up this morning B.five hours 5.Weve been here for_.A.one hour B.one oclock AABAB第11页/共31页6.My parents have owned this house for_.A.a long time B.many years ago7.Theyve been in love since_.A.last spring B.three months8.We have known each other since_.A.one year B.last year9.-How long have you been like this?-Since_.A.last night B.two days10.-How long has she worked here?-She has worked here for_.A.1993 B.six yearsAABAB第12页/共31页 Exercise根据所给情况，用just,already或yet造句。1.After lunch you go to see a friend at her house.She saysWould you like something to eat?You say:No,thank you._(have lunch)2.Joe goes out.Five minutes later,the phone rings and the caller says Can I speak to Joe?You say:Im afraid _.(go out)he has just gone outIve just had lunch.第13页/共31页3.You are eating in a restaurant this evening.The waiter thinks you have finished and starts to take your plate away.You say:Wait a moment!_ (not/finish)4.You are going to a restaurant this evening.You phone to reserve(预定）a table.Later your friend says Shall I phone to reserve a table?You say:No,_ it (do)I havent finished it yet.I have already done 第14页/共31页1.现在完成时用来表示过去发生或已完成的动作或状态对现在造成的影响或结果,也就是说,动作或状态发生在过去但它的影响现在还存在.I have lost my wallet.(含义是:现在我没有钱花了.)Jane has just had it.(含义是:简现在不饿了.)Michael has been ill.(含义是:现在仍然很虚弱)He has returned from abroad.(含义是:现在已在此地)第15页/共31页2.现在完成时可以用来表示发生在过去某一时刻一直持续到现在的动作和状态,常与表示持续的时间状语连用.表示持续动作或状态的动词多是延续性动词。I havent seen her these days.Mary has been ill for three days.I have lived here since 1998.第16页/共31页3.现在完成时往往同表示不确定的过去时间状语连用,如already,yet,just,before,recently,still,lately等:He has already finished his work.I havent seen him recently(lately).We have seen that film before.Have they found the missing child yet？第17页/共31页4.现在完成时常常与表示频度的时间状语连用,如 ever,never,twice等:Have you ever been to Beijing？I have never heard of Bunny.I have used this pen only three times.第18页/共31页have(has)gone和have(has)been的区别1.have(has)gone表示“已经去某地了”ShehasgonetoShanghai.(她可能已在去上海的路上，或已到上海，总之现在不在这里。)2.have(has)been表示“曾经去过某地”ShehasbeentoShanghaithreetimes.(她已经不在上海，只说明她曾经去过。)第19页/共31页非延续性动词不能与时间段连用：非延续性动词不能与时间段连用：go/come/begin/start/die/buy/borrow/sell/leave/arrive/receive/become等词语是瞬间动词表示的动作是一时的，等词语是瞬间动词表示的动作是一时的，不能延续，不能与不能延续，不能与for、since等表示一段时间的词连用，等表示一段时间的词连用，也不能用于也不能用于how long引导的疑问句中。引导的疑问句中。如不能说：如不能说：He has borrowed the book for two months.()但可以说：但可以说：He has kept the book for 2 months.或：或：It has been 2 months since he borrowed the book.或：或：Two months has passed since he borrowed the book.这些瞬间动词常与它对应的可以表示时间段的词语进行互换。becomebe borrowkeep buyhave begin(start)be on openbe open diebe dead leave-be away come-be here/in go outbe outjoin-be a member/be in begin to study-study注明：非延续性动词在否定结构中可用于现在完成时态：I havent bought anything for two days.第20页/共31页动词的过去分词的规则变化，在动词后加ed，规则变化有以下四种：原形+ed如：worked,passed词尾是e时，直接加d如：likedlived若词尾为“辅音字母加y”，则改y为i加ed。词尾为“元音字母+y”时，直接加d；如:playedstayedstudiedcried末尾只有一个辅音字母的重读闭音节是，双写最后一个辅音字母加ed.如：stoppeddropped动词的过去分词的规则变化第21页/共31页不规则动词的过去式以及过去分词不规则动词的过去式以及过去分词巧记规律巧记规律AAA:put put put letlet letABA:becomebecamebecomeABB:standstoodstoodABC:eat ateeaten第22页/共31页AAAcost-cost-cost read-read-readput-put-put cut-cut-cutlet-let-let set-set-setbeat-beat-beat hit-hit-hit hurt-hurt-hurt spit-spit-spit rid-rid-rid一、原形、过去式和过去分词的词形和读音都相同的单词，结尾字母一般是t或d。特殊：动词read的过去式和过去分词虽然词形与原形一致，read-read-read，但发音分别是ri:d-red-red。第23页/共31页有些动词的过去分词与原形是一样的:run-ran-runcome-came-comebecome-became-becomeovercome-overcame-overcomeABA第24页/共31页原型原型过去式过去式过去分词过去分词例词例词-eep-ept-eptkeep,sweep,sleep-ell-old-oldsell,tell-d-t-tlend,spend,send,build-ay-aid-aidsay,pay,lay-n-nt-ntburn,learn,mean-ee-e-e-meet,feed-ought-oughtbring,buy,fight,think-aught-aughtcatch,teachABB(含规则动词)第25页/共31页1.另有一些其它形式的变化。have(has)-had-hadleave-left-leftlose-lost-lostmake-made-madefeel-felt-feltspell-spelt-speltstand-stood-stood2.改变单词中间元音字母。sit-sat-sat(babysit)win-won-wonshine-shone-shonehold-held-heldfind-found-foundhear-heard-heardhang-hung(hanged)-hung(hanged)ABB(含规则动词)第26页/共31页ABC原型原型过去式过去式过去分过去分词词例词例词-eak-oke-okenbreak,speak-eal-ole-olensteal-ear-ore-ornwear,bear,tear-ow（aw）-ew-owngrow,blow,know,throw,draw-i-a-u-sink,swim,drink,ring,sing,begin-i-o-ndrive,rise,ride,write第27页/共31页ABC有些动词的过去分词是在原形词尾加n或en，变成以en结尾的单词。take-took-takengive-gave-givenfall-fell-falleneat-ate-eatenwrite-wrote-writtenspeak-spoke-spokenfreeze-froze-frozenride-rode-riddenget-got-gotten(got)forget-forgot-forgotten(forgot)特殊：am/is-was-beenare-were-been,do(does)-did-donego-went-gonesee-saw-seenshow-showed-shown(showed)lie-lay(lied)-lain(lied)第28页/共31页比较现在完成时和过去时的区别：比较现在完成时和过去时的区别：*现在完成时所表示的是过去的发生的动作对现在现在完成时所表示的是过去的发生的动作对现在造成的影响和结果，强调的是现在的情况，所以不造成的影响和结果，强调的是现在的情况，所以不能和表示过去的时间状语连用，如：能和表示过去的时间状语连用，如：yesterday，last night,three weeks ago,in 1990。*一般过去时表示的是过去发生的动作或状态，和一般过去时表示的是过去发生的动作或状态，和现在不发生联系，它可以和表示过去的时间状语连现在不发生联系，它可以和表示过去的时间状语连用。用。I have seen the film.(我了解这部电影的内容。我了解这部电影的内容。)I saw the film last week.（只说明上星期看了这（只说明上星期看了这部电影，不涉及现在的情况。）部电影，不涉及现在的情况。）第29页/共31页总结现在完成时：1、构成：have/has+过去分词。2、概念：(1)表示过去或已经完成的某一动作对现在 成的影响或结果。常与下列状语连用:already,just,yet,ever,never,before(2)表示过去已经发生，持续到现在的动作或状态，可以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。a.for和表示一段时间的词组连用。如：for 3 years b.since和表示过去某一时刻的词或词组连用。如：since 1997,since two years ago,since last week 第30页/共31页感谢您的观看！第31页/共31页
