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动词不定式基本形式:to＋动词原形否定形式:notto＋动词原形有名词形容词和副词的功能作主语表语宾语宾补定语状语一作主语:1Totellalieiswrong.说谎是错误的.2Tosavetimeistolengthenlife.节约时间就等于延长了人的生命3.It’shardtosay.这很难说4.ItisimpolitetoeatnoisilyinCuba.在古巴大声地吃东西是不礼貌的.5.Butitwilltakeusafewdaystogettherebybike.但是骑自行车到那要花几天时间.【不定式作主语,常用it形式主语．常用的句型:“Itis＋形容词＋（for/of＋sb.）＋todo…”】二作表语1.Hisdreamistobeadoctor.他的梦想是成为医生.2.Yourtaskistofindoutthecostbybus.你的任务是查出坐公车的费用.3.Ithinkthemostexcitingwayistosellflowersintheevening.我认为晚上卖花是最令人兴奋的.【不定式作表语,一般放在be动词的后面,常用来表示预定要发生的动作,也指未来的假设.】三作宾语1.Iwanttomakeacardformyteacher.我想为我的老师做一张卡片.2.Wedecidetotakethetrain.我们决定坐火车.3.LILeilikestorideabike..李雷喜欢骑自行车.4.Theyhelped（to）raisemoneyforaschool.他们帮助一所学校筹钱.【动词want,hope,like,begin,try,need,forget,learn,plan,decide等词后面常接不定式作宾语,help后面接不定式作宾语,可带to,也可省略.】四作宾补1.Theteachertoldhimnottobelatenexttime.老师告诉他下次别再迟到.2.MissWangaskedLiPingtobookthetickets.王老师叫李平去定票.3.Tellthechildrennottoeatunhealthyfood.告诉孩子们不要吃不健康的食物.4.Kangkanghelpedus（to）bookthetraintickets康康帮助我们订了火车票.【动词ask,tell,want,invite,teach,allow,wish常接带不定式作宾补;makehaveletseewatchnoticefeelhear;常接不带to的不定式作宾补.Help可带可不带.】五作定语1.Thebestwaytotravelisbytrain.旅游的最好方式是乘火车.2.Ineedapentowritewith.我需要一只笔来写.3.Wehaveacoldroomtolivein.我们住的是间冰冷的房子.4.Shehasalotofworktodo.她有许多事要做.5.Thereisnothingtoworryabout.没什么可担忧的.【不定式作定语通常要放在被修饰的词后面,且和被修饰名词存在逻辑上的动宾关系,动词是不及物动词,应有必要的介词.】。六作状语1.Topasstheexamsuccessfully,Dickworkshardathislessons.为顺利通过考试,迪克在努力学习.2.Theyorganizedashowtoraisemoney.为了筹钱,他们组织一场展示表演.3.Let’sworkingroupstofindouttheinformationaboutthecost.让我们小组合作,一起查找费用信息.【不定式在句子中作状语可表示目的结果或原因等.】。七动词不定式的否定形式:not＋动词不定式1.Thepolicemantoldtheboysnottoplayinthestreet.警察叫那些男孩不要在街上玩耍.2.Theteacherasksusnottobelateforschool.老师要求我们上学不要迟到.八疑问词＋不定式“疑问词＋不定式”结构相当于名词性短语,作主语宾语和表语.Idon’tknowwhattodoandwheretogo.我不知道该做些什么,该去哪儿.一Doexercises:1.Asyoungadults,itisourduty_________(try)ourbesttodealwitheachchallenge...2.Theheadteachersaiditwasnecessary__________(talk)withhismother.3.How________(make)requestspolitelyisimportant4.Thebestway____________(improve)yourEnglishistojoinanEnglishclub.5.Thefirstthingis___________(greet)theteacher.6)Wedecided__________(talk)tosomestudentsaboutwhywewentthere.totrytotalktomaketoimprovetogreettotalk7)Heprefers__________(eat)whitebreadandrice.8)I’dlove_________(visit)Mexico.9)Couldyoupleasetellmewhere________(park)mycar?10)Itgivesadviceonwhat_____(do)inlotsofdifferentsituations.11)ThenIstarted_________(watch)English-languageTV.12)I’mbeginning____________(understand)myChineseroots,andwhoIam.toeattoparktodotowatchtounderstandtovisit一.Doexercises.1．It'sourduty_________theroomeveryday.A.tocleanB.cleanedC.cleanD.cleans2.Hefounditverydifficult______.A.sleepingB.sleepsC.sleptD.tofallasleep3.Mr.LioftenteacheshisJapanesefriends______Chinesefood.A.cookB.cooksC.tocookD.cooked4.I'msorry______that.A.hearsB.hearingC.hearD.tohear5.Mymotherwasveryglad______heroldfriend.A.tomeetB.meetC.metD.meetsADCDA6．Wouldyoulikesomething______?A.drinkB.drinkingC.todrinkD.drinks7.Iwasmade______myhomeworkintheafternoon.A.doB.doingC.todoD.did8.Somuchworkusuallymakesthem______verytired.A.tofeelB.feelsC.feelingD.feel9.Yourfatherissleeping.You'dbetter______.A.notwakeuphimB.nottowakeuphimC.notwakehimupD.nottowakehimup10.Wearegoingforapicnictomorrow.I’llcallTomtomakesure________.AwhytostartBwhattostartCwhichtostartDwhentostartCCDCDSUMARRY:Inthisperiod,wecompletethetask:1)Reviewthecontentoflastperiod.2)ReviewtheusingoftheInfinitives.3)Dotheexercises.Homework:1Previewthenextperiod.2Revisethewordsandphases.3Finishtheexercisesaftertheclass.Thankyouandgoodbye!