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动词不定式的用法讲解一、动词不定式：构成：to+动词原形（to只是不定式符号，没有意义）动词不定式作主语较长时，常用it作形式主语，而将真正的主语放在句末。1.It+is/was+形容词+(forsb.)+动词不定式TolearnEnglishwellisuseful.=It’susefultolearnEnglishwell.学好英语是有用的。Toprotectenvironmentisimportantforus.=It’simportantforustoprotectenvironment.对于我们来说保护环境是很重要的。2.Itis/was+kind/good/nice/clever+ofsb.+动词不定式It’sverykindofyoutohelpme.你帮助我真是太好啦。It’sverycleverofyoutodolikethat.你那样做真的太聪明啦。3.Ittakes(took,willtake)sb.sometimetodosomething.(做某事花费某人…时间)4.Itisagoodideatodosth.作宾语1.常见的跟不定式作宾语的动词有：wanttodosth.decidetodosth.hopetodosth.plantodosth.offertodosth.agreetodosth.learntodosthtrytodosthprefertodosthpromisetodosth.needtodosth.expecttodosth.2.主语+find/think+it+形容词+(forsb.)+todoIfinditeasytoreadEnglisheveryday.我发现每天读英语和容易的。Hefeltithardtosleep.他觉得很难入睡。IthinkitveryinterestingtolearnEnglish.我认为学英语很有趣。Wefounditimpossibletocrosstheriver.我们发现过河是不可能的。3.特殊疑问词+动词不定式作宾语Canyoutellmehowtogettothepostoffice?Ididn’tknowwhattodonext.动词不定式作宾语补足语：1.asksbtodosth.tellsbtodosth.invitesbtodosthwantsbtodosthwishsbtodosthordersbtodosthadvisesbtodosthallowsbtodosthwaitforsbtodosthThequestionisdifficulttoanswer.这个问题很难回答Theroomiscomfortabletolivein.这个房间住起来很舒服Heiseasytogetalongwith.他很容易相处I’mgladtoseeyouagain.很高兴再次见到你Shetoldmetobuyaticket.她让我去买张票2.要省去to.注意:宾语补足语：补充说明宾语的。宾语和宾补之间有逻辑的主谓关系。Hetoldmetoleaveatonce.Hemadethebabylaugh.跟省to的不定式的动词(感使动词)：一感feel二听listento,hear三使make,let,have四看lookat,watch,see,notice五半帮助helpTheteachershelpedthestudents(to)learnEnglishwell.那些老师帮助学生学好英语。Heoftenhelpshismother(to)tidyuptheroom.他经常帮助他妈妈整理房间。作表语，表示主语的“职业、职责或性质”Herjobistocleanthehall.她的工作就是打扫大厅。Mydreamistobeateacher.我的梦想是当一名教师。作定语动词不定式修饰名词或代词，起形容词的作用，在句中作定语，特点：①.要放在被修饰的名词或代词之后。Ihavealotofbookstoread.Wouldyoulikesomethingtoeat?作状语Heworkeddayandnighttogetthemoney.（表目的）他日夜工作来赚钱。(too...to...,和...adj/advenoughtodosth)（表结果）Sheistooyoungtogotoschool.Sheisn'toldenoughtogotoschool.Theywereverysadtohearthenews.（表原因）听到这个消息他们非常伤心。Thequestionissimpleforhimtoanswer.（表程度）这个问题对他来说太容易回答了。不定式的否定式是在不定式前加notTheytoldusnottoplaybasketballtoolong.Youhadbetternotgotobedlate.动词不定式练习1.Hecame________(give)usatalkyesterday.2.Sheisalwaysthelast______(come).3.Tompromised________(attend)themeeting.4.Hewasluckyenough_______(find)aseat.5.LiMingwastooexcited______(say)aword.6.Thebossmadethem__(work)thewholenight.7.Hisjobis_____(look)aftertheanimalsinthezoo.8.Mydreamis_____(fly)tothemoononeday.9.It’skind______you_______me.A.of,helpingB.of,tohelpC.for,helpingD.for,tohelp10.It’shard_____(of,for)us_____(learn)Englishwell.11.Itried______(notmake)anynoise.12.Ineed_______(practise)speakingmoreEnglish.13.Idon’tknowhow______(use)thewashingmachine.14.Doyouwanttogetsomething______(eat)?15.Thereisnomoreroom______(live)in.16.Myteacheroftentellsme______(listen)carefullyinclass.17.WeoftenseeMary_______(help)othersonherwayhome.18.Ourteacherasksus_____(write)downthenewwords.19.---Marydancesbestinourschool.---Iagree.I’llneverforget______herdanceforthefirsttime.A.seeingB.toseeC.seeD.seen20.Hehasnothing_____onSundaysandhefeels_____.A.todo,interestingB.doing,boringC.todo,bored21.Pleasestop______arestifyoufeeltired.A.tohaveB.havingC.haveD.has