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动词不定式的构成：(not)to+do(动词原形)•A‘to’-infinitivecanbeusedas…主语（Subject）表语（Predicative）宾语（Object）宾补（Objectcomplement）定语（Attributive）状语（Adverbial）Ⅰ不定式用作主语Togrowtreesisveryimportant.Itisveryimportanttogrowtrees.不定式作主语时,往往放在谓语之后,用it作形式主语。Sayinanotherway,using‘it’.1.Tolearnfromyourfriendsisimportant.2.Toleavewithoutsayinggoodbyeisimpolite.3.TochatwithMissWhiteisapleasantthing.4.Towalktoschooltakesmetenminutes.Itisimportanttolearnfromyourfriends.Itisimpolitetoleavewithoutsayinggoodbye.ItisapleasantthingtochatwithMissWhite.Ittakesmetenminutestowalktoschool.Itis+adj.+forsb.todo…≠sb.is\are+adj.+todo…Itis+adj.+ofsb.todo…=sb.is\are+adj.+todo…你那样做是有礼貌的。Itispoliteofyoutodothat.=Youarepolitetodothat.(good,kind,nice,rude,clever,right,silly,thoughtful,brave,selfish…)(easy,hard,difficult,important,possible,necessary…)对他来说，说英语很容易。对我们来说，努力学习是必要的。您能帮助我，真是太好了。ItiseasyforhimtospeakEnglish.Itisnecessaryforustostudyhard.Itisverykindofyoutohelpme.Ⅱ不定式放在be动词后面，用作表语•Mydreamistobeagoodteacher.•Itsworkistocleantheroomeveryday.Completethefollowingsentences.1.Thedoctor’ssuggestionis______(take)moreexercise.2.Thebestwayis______(talk)toyourparents.3.Hisplanis______________________________(今年夏天到北京旅游).4.Mypurposeis__________________________(帮你解决这个问题).totaketotalktotraveltoBeijingthissummertohelpyousolvethisproblemⅢ不定式放在及物动词后，用作宾语WebegintoreadEnglishat6:30a.m.Sheforgottoclosethedoor.常用动词不定式作宾语的动词有：want,plan,hope,wish,learn,decide,wouldlike,begin,start,try,need,forget,choose,prepare,agree,promise,manage,encourage,Completethefollowingsentences.1.I_______________(希望收到…来信)yousoon.2.John________________(不想当)thehostofthecharityshow.3.They’re____________(试着解决)theproblembyhimself.4.Millionsofpeople_________________(已学会使用)computers.hopetohearfromdoesn’twanttobetryingtosolvehavelearnedtousethink/find/consider+it+adj.+todo动词不定式作宾语的注意事项（ⅰ）不定式作宾语时，如带有宾语补足语，则要把不定式放到后面，用it作形式宾语，构成“主语+动词+it+宾补（形容词、名词）+不定式”结构。如：Ifounditnecessarytotalktohimagain.IfounditimportanttolearnEnglish.动词不定式作宾语的注意事项（ⅱ）•有些动词既可跟不定式作宾语，也可跟动名词作宾语，但含义不同：forgettodosth.忘记要做某事forgetdoingsth.忘记曾经做过某事stoptodosth.停下来去做某事stopdoingsth.停止做某事goontodosth.继续做另一件事goondoingsth.继续做原来在做的事needtodosth.需要做某事needdoingsth.需要被做1.别忘了离开时把灯关了。Don’tforgetbeforeleaving.2.父亲必须戒烟了。Fathermuststop.3.他看完电视后，继续看了一会书。AfterhewatchedTV,hewentonforawhile.4.这辆自行车需要修理了。Thisbikeneeds__________________________.toturnoffthelightssmokingtoreadrepairing/mendingⅣ不定式用作宾语补足语•SheaskedmenottowatchTV.•Lucytoldhimnottocry.•Tellhertoturnitdown.ask,tell,want,need,wish,warn,advise,encourage,invite,expect,teach,wouldlike,…hopesb.todosth.wishCompletethefollowingsentences.1.MrLu_________________(要求我们交)ourhomeworkontime.2.Thedoctor________________________(建议格林先生喝)morewater.3.MrWu___________________________(叫学生别嚷嚷)inclass.4.MrsRead_____________________(希望儿子学)Englishwell.asksustohandinadvisedMrGreentodrinktellsthestudentsnottoshoutwisheshersontolearn四看三使二听一感觉:feel☆不定式作宾补省去to的情况(在被动语态中则to不能省掉)help可带to，也可不带tohelpsb(to)dosthhearlistentoletmakehaveseewatchlookatnotice•hadbetterdosth./notdosth.•Whynotdosth…?•Wouldyoupleasedosth.?•Wouldratherdothandosth.☆不定式作宾补省去to的情况(在被动语态中则to不能省掉)1.JohnwasmadethecarforaweekasapunishmentA.towashB.washingC.washD.tobewashing2.Thepatientwaswarnedfoodaftertheoperation.A.toeatnotB.eatingnotC.nottoeatD.noteating3.Internetbarsmustn’tletanybodybadthings,especiallychildren.A.watchB.towatchC.watchingD.watchesACAExercises:感官动词(feel,listento,hear,see,watch,lookat,notice)后既可跟不带to的不定式作宾补，也可跟v-ing作宾补.前者表示动作的全部过程已结束；后者表示动作正在进行。Ioftenhearhersinginthenextroom.Iheardhersinginginherroomjustnow.Ⅴ不定式用作定语ⅰ不定式作定语时，应放在被修饰词的后面。Wehavealotofhomeworktodo.ⅱ如果不定式中的动词是不及物动词,则不定式中要有介词.Heislookingforaroomtolivein.Thereisnothingtoworryabout.ⅲsomething,anything,nothing…+adj.+todoIhavesomethinginterestingtotellyou.Findtheto-infinitiveineachsentence.1.MrWuisalwaysthefirsttocomeandthelasttoleave.2.Thereisnoneedtotroublehim.3.Haveyougotanythingimportanttotellme?4.I’vegotnothingtoworryabout.5.I’mthirsty.Givemesomethingtodrink.6.Springisthebestseasontoplanttrees.7.Weallhaveachancetogotocollege.Ⅵ不定式用作状语1.cometodosth.2.gotodosth.3.stoptodosth.4.inorder(not)todo5.too+adj.+todosth.6.adj.\adv.+enoughtodosth.Completesomesentences:1、_________________________________(为了提高英语成绩),TomgoestotheEnglishcornereveryday.2、Iwas__________________________(太累了，难于入睡。)3、Sheranfast_______________________(为了赶上早班车).4、Heis____________________________(富有得可以买辆小汽车).InordertoimprovehisEnglishtootiredtofallasleep.tocatchthefirstbusrichenoughtobuyacar.疑问词+不定式不定式与疑问词who,which,when,how,what,where等连用，在句中起名词作用，可充当主语、表语、宾语等。☆在与why连用时，只用于why或whynot开头的简短疑问句中，后面紧跟的动词不定式不带to。Whynothavearest?Completethefollowingsentences.1.Hedidn’tknow.(说什么)。2.isveryimportant.(如何解决这个问题)3.Myquestionis.(什么时候开始)。4.Pleaseshowus.(如何使用计算机)5.Idon’tknowforyou．(买什么东西).whattosayHowtosolvetheproblemwhentostarthowtousethecomputerwhattobuy用作介词的to(to+名词/动名词)lookforwardtohearingfromyoubeusedtogettingupearlydevotehimselftohelpingpoorchildrenpayattentiontoyourspellingpreferwatchingTVtodoinghomework…Completethefollowingsentences.1.Wealllookforwa