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当我们要表示“想做某事、需要做某事或决定做某事”时，就会出现两个动词连用的情况，这时应如何表达呢？同学们自然会想到wanttodosth.,needtodosth.和decidetodosth.等表达方式。Modulegrammar动词不定式1.什么是动词不定式？主要行为动词后面的动词采用了“to+动词原形”的结构，我们把这种结构称为动词不定式（有时可以不带to）。动词不定式没有人称和数的变化，在句子中不能作谓语。下面我们一起来看一下动词不定式有哪些语法功能。2.动词不定式的语法功能：(1)不定式作主语不定式作主语时，常用it作形式主语，而将作主语的不定式放在句子后部。eg.Itisgoodtohelpothers.帮助他人是好的。ItisexcitingtosurftheInternet.上网是令人兴奋的。(2)不定式作宾语学习不定式作宾语时,要注意掌握后接不定式作宾语的动词。常见动词有:want,hope,wish,like,begin,try,need,forget,agree,help等。Manypeopledecidenottothinkaboutit.许多人决定不去考虑这件事。Iwanttogotothelibrary.我想去图书馆。(3)不定式作定语不定式修饰名词或代词，起形容词的作用，在句中作定语，放在被修饰对象的后面。请看下列句子：Ihavealotofhomeworktodo.我有很多作业要做。I’mhungry.Givemesomethingtoeat,please.我饿了。请给我点吃的吧。(4)不定式作状语不定式常常作目的状语、原因状语、结果状语等。不定式作状语时，要注意不定式的逻辑主语应与句子的主语保持一致。IcametoBeijingtoseemygrandpa.我来北京看望我的爷爷。I’mgladtomeetyou！很高兴见到你！I’mtootiredtowalk.我太累了，走不动了。动词不定式的功能5.动词不定式做宾语补足语。动词不定式作宾语补足语，是对宾语的补充说明。常见的动词有：want,tell,wouldlike,choose,allow,ask,invite,help等。注意：（1）以上动词后接不定式做宾语补足语时，若要表达否定意思，要在todo前面加not，构成nottodo的形式。e.g.Mr.Hantoldusnottomaketoomuchnoise.（2）有些动词后接不定式做宾语补足语时，可以接不带to的不定式，常见的这类动词有：help,make,let,have,hear,feel,see等。e.g.Hiswordsmadeeveryonelaugh.一感:feel（感觉）二听:listento（听）、hear（听见）三让:let、make、have四看:watch、see、look、notice、observe半帮助:help.因为既可以说helpsbdosth亦可以说helpsbtodosth•allowsb.todosth.允许某人做某事•choosesbtodosth.选择某人做某事•wantsb.todosth.想要某人做某事•tellsb.todosth.告诉某人做某事•asksb.todosth.要求某人做某事•invitesb.todosth.邀请某人做某事•helpsb.(to)dosth.帮助某人做某事•feel/listento/hear…sb.dosth.(6)不定式作表语不定式还可以作表语。例如：Ourdutytodayistocleanthefloor.今天我们的任务是打扫地板。1.Becauseitallowspeople______closertothem.2.It’ssad_______ofthepandasandotheranimalsindanger.3.Weneed_______thembetter.4.Manywildanimalsdon’thaveasafeplace______.5.Wewant_______animalsindanger.6.Thatmeanswecangivemoney______protecttheanimals.7.Let’sfindoutwhatelsewecando_____asmanyasanimalsaspossible.1.Scientistsdoalotofresearch_______________________________________________________________________.2.Thegovernmentissettingupnatureparks_________________________.3.TheWWFchosethepanda_____________.4.TheWWFisworkinghard____________________________.Inordertoprotectpandasinthewild,thegovernmentissettingupnatureparksanddevelopingotherplans.to“inordertodo”/“todo”referstothepurpose(目的):为了…Thegovernmentissettingupnatureparksanddevelopingotherplansprotectpandasinthewild.inorderto•动词分为两类•一：谓语动词（一般跟在主语后作谓语）•二：非谓语动词（一般跟在谓语动词后）•如果是谓语动词，要考虑时态和人称；如果是非谓语动词，要考虑用do/todo/doing.todo：want/hope/learn/try/decide/forget/remember/like/love/stop/go/come/plan等inordertodo/todo表目的do：情态动词、make\let\help\hadbetter动词一般现在时:结构、标志词、用法一般过去时、过去进行时现在进行时谓语动词（主语后）非谓语动词doing：practise/enjoy/finish/suggest/keep/like/介词结尾的短语（thinkof/begoodat/dowellin\payattentionto\lookforwardto）havetroubledoingspend…(in)doing一般将来时1.Wouldyoupleasetellmenext?A.howdoB.whattodoC.whatdoIdoD.howIshoulddo2.Thegirlwasn’ttoliftthatbookcase.A.toostrongB.enoughstrongC.strongenoughD.sostrong一、单项选择。Practice3.Foratimehisgrandmotherfound______accepthisnewidea.A.hardB.ithardC.ithardtoD.hardto4.Asshehasneverbeentherebefore,I’llhavesomeone_____hertheway.A.showB.toshowC.showingD.showed5.You_____driveslowly.Theroadsarewet.A.hadratherB.wouldratherC.hadbetterD.wouldbetter7.Intheolddaysitwasdifficultforthepoor_______ajob.A.findB.tofindC.lookD.tolookfor8.Whenlearningaforeignlanguage,tryyourbest_____thespiritofit.A.masterB.holdC.takeholdofD.tomaster9.Itwasfoolish_______hiscarunlocked.A.forhimtoleaveB.ofhimtoleaveC.forhimleaveD.himtoleave10.Remember______thenewspaperwhenyouhavefinishedit.A.puttingbackB.putbackC.toputbackD.willputback13.—Youwerelostonyourwaytothelake,weren’tyou?—Yes,wewereandhadtostop_____theway.A.askingB.toaskC.askedD.tobeasked二、用所给动词的适当形式填空。1.Doyouknowwhen________(have)apicnic?2.Sheisverybusytoday.Shehasalotofwork_____(do).3.Ourteacheraskedus_____(be)carefulwhenwecrossedtheroad.4.It’seasyforus_________(answer)thequestion.tohavetodotobetoanswer三、汉译英。1.我们需要更好地保护它们。Weneedtoprotectthembetter.2.许多动物没地方住。Manyanimalshavenoplacetolive.3.我们究竟能做什么？Whatonearthcanwedo?4.现在有许多濒危动物。Nowthere’remanyanimalsindanger.HomeworkPleasewriteashortpassageaboutanimalsindanger.Happinessisaformofcourage.幸福是勇气的一种形式。