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•like/enjoy/prefer,keep,practice,go,finish,getusedto;•haveproblem/difficulty/fundoing,beworthdoing,•spend…doing,bebusydoing,lookforwardtodoing,•makeacontributiontodoing,mind,avoid，stop•喜欢的话，就保持练习去完成它，它虽然难但还是很有趣，它值得你花费时间为它忙碌，我期待你为它作出贡献，难免介意，避免停止它！to+动词原形•Hewantedtobeaninventor.•Tellhertoturnitdown.(object)(objectcomplement)(vt.)(vt.)•Theyhavealittlefoodtoeat.•Toseeistobelieve.•Hecametoseeme.(attribute)(adverbial)(subject)(vi.)•Todanceisalotoffun.Itisalotoffuntodance.(subject)•Itisdangeroustoplaywithfire.Toplaywithfireisdangerous.•Togrowtreesisveryimportant.Itisveryimportanttogrowtrees.a.不定式用作主语•Toplaywithpetsisinteresting.(Itisinterestingtoplaywithpets.)•Todothejobwellisnoteasy.(Itisnoteasytodothejobwell.)Itis(was)+adj.+ofsb.to…您能帮助我，真是太好了。Itisverykindofyoutohelpme.=Youareverykindtohelpme.你做那样的事是对的。Itisrightofyoutodothat.=Youarerighttodothat.对他来说，说声再见是最明智不过了。Itwascleverofhimtosaygood-bye.Itis(was)+adj.+forsb.to…对他来说，说英语很容易。ItiseasyformetospeakEnglish.对我们来说，努力学习是必要的。Itisnecessaryforustostudyhard.b.不定式放在be动词后面，用作表语•Mydreamistobeadoctor.•Histaskistofindoutthecosttotravelbytrainc.不定式放在及物动词后，用作宾语•Theybegantoreadandwrite.•Helikestoplaysoccer.•IfounditimportanttolearnEnglish.常见的及物动词有：want,hope,wish,like,begin,start,try,need,forget,agree,know,learn,refuse,help,etc.•Whatdoyouwanttobewhenyougrowup?•Wouldyouliketogowithus?•Ihopetodoitmyself.(×)Ihopeyoutodoityour-self.疑问词+不定式•我知道如何煮。Iknowhowtocook.•我不知道要买什么东西给你。Idon’tknowwhattobuyforyou.•他告诉我如何使用计算机。Hetoldmehowtousethecomputer.•你能告诉我走哪条路吗？Canyoutellmewhichwaytogo?d.不定式用作宾语补足语•Sheaskedmetospeakmoreloudly.•Lucytoldhimnottocry.•Tellhertoturnitdown.不定式中省去to的情况•感官动词see,watch,•使役动词lookat,hear,listento,feelmake,have,letmakesb/sthdosth.•我看到她正表演芭蕾。Ioftensawherperformballet.•老板迫使他工作了一整夜.Thebossmadehimworkthewholenight.helpsbtodosth.helpsbdosthhelpsbwithsth帮助某人做某事•Ioftenhelphim(to)cleantheroom.a.不定式在不及物动词后作状语表示目的•Tomcametoseemelastnight.•Laterhelefthometoworkindifferentcities.b.不定式在某些形容词后，作状语表示原因•Iamgladtobethere.•Iamsorrytotroubleyou.•Iamhappytocomehere.a.作定语，放在所修饰的名词或代词之后.•Ihavealotofworktodo.•Haveyougotsomethingtosay?•Theyhavelittlefoodtoeat.•TheywerethefirsttocometoChina.•Ihavesomebookstogiveyou.•Theyhavealotofthingstotalkabout.•Heislookingforaroomtolivein.•Thereisnothingtoworryabout.不定式是vi,后面应有必要的介词。something+todo•Shehasnothingtosay.•Iwantsomethingtoeat.•Wouldyoulikesomethingtodrink?•Isthereanythingtoeat?something+adj.+todo•Givesomethinghottodrink.•Ineedsomethingnicetoweartothepartynextmonth.•Doyouhaveanythingcoldtodrink?我太累了，难于入睡。小男孩吓得一步也动不了。Theboywastoofrightenedtomove.Iwastootiredtosleep.too+adj./adv+todo…太…(以致)不能(做)…too…forsb/sthtodo…这箱子太沉了,他抬不起来.Theboxistooheavyforhimtolift.Theboxissoheavythathecan’tlifeit.李明太激动了，一句话也说不出来。LiMingwastooexcitedtosayaword.LiMingwassoexcitedthathecouldn’tsayaword.adj.+enoughtodosth.十分（足够）……他很富有，可以买辆小汽车。Heisrichenoughtobuyacar.Heissorichthathecanbuyacar.adv+enoughtodo…她跑得够快了，完全可以第一个到达。Sherunsfastenoughtogettherefirst.Sherunssofastthatshecangettherefirst.单项选择•Tellhim___thewindow.A.shutB.nottoshutC.tonotshutD.notshutB•Idon’tknow____next.A.whattodoB.todowhatC.whichtodoD.howtodoA•Itisveryimportant_____us_____it.A.to,torememberB.for,torememberC.for,rememberingD.to,rememberingB•Ittookusmorethantwohours___thedinner.A.prepareB.preparingC.toprepareD.bepreparedC•Thereisgoingto___anim-portantmeetingtomorrow.Pleasetry___late.A.have/nottobeB.have/notbeC.be/nottobeD.be/notbeC•Atlast,hedecided___hismothertothehospital.A.takeB.tookC.totakeD.takingC•Thenewsmadeus___sad.A.feelingB.tofeelC.feelD.feltC•It’stimeforMeimeiand___towork.A.metogoB.ItogoC.megoingD.IgoingA•Wouldyoulike___forme?A.tomakeakiteB.makeakiteC.makingakiteA•Mymotheralwaystellsme___there.A.notgoB.nottogoC.goD.don’tgoB•Motherisill.We’dbetter___hertothehospital.A.totakeB.takingC.takeD.takesC•It’sverynice___youtosayso.A.forB.ofC.toD.inB•Isthere_____intoday’snewspaper?A.anythingimportantB.somethingimportantC.nothingimportantA•Whatabout___fishingto-morrow?A.togoB.goC.goingD.wentC•Onlyonecanhaveanapple,___you___Mary.A.both,andB.not,butC.neither,norD.either,orD•ThepopulationofShanghaiislargerthan___ofWuhan.A.theseB.thisC.thatD.thoseC•Wouldyougetsomechalkforme?___.A.Yes,pleaseB.WhynotC.WithpleasureC•Idon’tknow___.A.howtosayB.whattosayC.tosayhowD.tosaywhatB•Whataboutsomething___?A.drinksB.drinkC.drinkingD.todrinkD•Hewas___clever___hepassedtheexameasily.A.too,toB./,enoughC.so,thatD.suchthatC•Thegirlwantedtoknow___English.A.learningB.howtolearnC.tolearnD.howlearnB•Mothertoldme___inbed.A.notreadB.notreadingC.don’treadD.nottoreadD•Willyouplease___mewhat___next?A.totell,todoB.telling,doC.tell,todoD.totelling,bedoneC•Letme__you__theflowers.A.help,waterB.tohelp,towaterC.help,wateringA•Lucy,couldyoupleasehelpme___themapontheblackboard?A.putintoB.putupC.putoutD.putonB•I’veneverbeentoBeijing__.A.beforeB.agoC.yetD.everA•Thereisgoingto___afoot-ballmatchinourschoolnestSunday.A.haveB.holdC.beD.hasC