【课件】Unit+4Discovering+Useful+Structures+课件人教版（2019）必修第三册

语法：动词不定式二，课前预习小粉书72-75页。主动

被动一般式进行式完成式三

动词不定式用法总结todotobedonetobedoingtohavedonetohavebeendone用法一:作主语

Toseeistobelieve.Itisveryusefultorememberasmanywordsasyoucan.Ittakesmetenminutestogotoschoolbybike.总结：不定式作主语放在_____或it作形式主语的句型中句首3.如果要说明不定式表示的动作是谁做的

,可以在不定式前加一个由for/of引起的短语,构成__________。2.不定式作主语时,可以用it作_______________.Itis+adj+for

sbtodo……5.Itis+adj+ofsbtodo………（修饰人品形容词）（修饰物的形容词）1.单个不定式作主语，谓语动词_________单数形式主语不定式的复合结构Summary6.Itis+n.+forsbtodo……7.Ittakes/took/willtake

sb.sometime/money

todosth.用法二：

作宾语Iwanttobeadmittedtoakeyuniversity.Iwouldliketoinviteyoutocomeandvisitmyhometown.总结：不定式作宾语放在一些动词后（如want,prefer,wouldlike,need,stop...）⑤stoptodostopdoing⑥goontodogoondoing⑦regrettodoregretdoing⑧can'thelptodo

can'thelpdoing①trytodotrydoing②remembertodorememberdoing③forgettodoforgetdoing④meantodomeandoing努力做...尝试做...记得要做...记得做过...忘记要做...忘记做过...打算做...意味着...停下去做(另一件事）停止做(正在做的事)继续去做(另一件事）继续做(原先没做完的事)遗憾要做...后悔做过...迫不及待做...情不自禁做...不定式和动名词作宾语的区别：动词不定式作宾语的注意事项不定式作宾语时，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：

e.g.Ifounditnecessarytotalktohimagain.IfounditimportanttolearnEnglish.不定式作宾语think/find/consider/make+it+adj.+todo用法三：作宾语补足语I’dpreferyoutoleavehimaloneWedon’tallowsuchthingtohappenagain.总结：不定式作宾语补足语（advice,allow,ask,beg,tell,invite,help,persuade,order,warn等后面多接不定式短语作宾语补足语）句法功能考点宾语want,hope,wish,offer,fail,plan,learn,pretend,refuse,manage,decide,attempt,strive,help,agree,promise,intend,prefer,wouldlike,expect,afford,ask+todosth.宾语补足语tell,ask,invite,force,get,beg,allow,wish,want,like,prefer,inspire,encourage,expect,advise,permit,order,warn,cause+sb.+todo不定式作宾补:引导不定式作宾补的动词：Theteachertoldmetocleantheblackboard.Iexpectyoutogivemesomehelp.五看watchseelookatobservenoticefeel三使letmakehave二听一感觉

warn,tell,allow,help,ask,force等+sb.do（省略to）+sb.todofeellistentohear半帮助help可省可不省Imadehimdohiswork.Hewasmadetodohiswork(byme).变成被动，被省略的to要还原。如果不定式是不及物动词,则后面需适当的介词。

Pleasepassmesomepapertowrite____.Shehasanicepentowrite_____.Heboughtaflatforthefamilytolive____.onwithin注意：

①不定式作定语要考虑与主语的关系，主语是不定式的逻辑主语，不定式要用主动式；反之用被动式。

Hehasmanythingstodo.

Hewantshisbiketoberepairedrightnow.②therebe句型中用主动表示说话人的行为，被动表示说话人要别人做某事。

Theremustbesomethingtofear.tobefeared.用法四：作定语Heisalwaysthefirstonetocometotheclassroom,andthelastonetoleave.Theteacherhasalotofworktodoeveryday.Everyoneshouldhavetheabilitytoearnaliving.总结：不定式作定语一般作后置定语，与被修饰词之间是主谓，动宾，同位关系。用法五：作状语Topasstheexam,youshouldworkashardasyoucan.Shewastooangrytosayaword.Shewasdisappointedtoknowtheresult.总结：不定式作状语（目的状语，原因状语，结果状语）tobefrank,tobehonest,tobeexacttobegin/startwithtosumuptotell(you)thetruthTotellthetruth,Iamnothappyatthemoment.不定式作状语独立结构用法六：作表语WhatIwanttodoistopasstheexam.总结：不定式作表语放在系动词（be动词，感官动词，变化类动词）后面。结构连系动词+不定式Thepurposeofeducationistodevelopafinepersonalityinchildren.Allhewantedwastobeleftalone.Severalproblemsremaintobesettled.

WhenIenteredtheroom,sheseemed

tobereadinganovel.

Thequestionishowtocarryouttheplan.

不定式作表语1.状态系动词（be动词am/is/are/was/were）2.持续系动词keep,remain,stay,lie,stand3.感官动词feel,sound,smell,sound,taste,look,seem,appear4.变化系动词become,grow,turn,fall,get,go,come,run5.终止系动词prove,trunout连系动词特殊用法：疑问词+不定式Idon'tknowwhattodo.Canyoutellmehowtosolvetheproblems?总结：疑问词（what,when,where,who,which,how+todo)四、用所给词的正确形式填空。

1.Somepowerfulcountriesoftenshowtheirmusclesoas___________(push)atothers.2.Itisanhonourforme_________________(invite)toattendthemeeting.3.Hepretended___________________(work)hardwhenhisbosspassedhim.topushtobeinvitedtobeworking4.Thebestway________(learn)howtodriveacaristopractisewithadrivinginstructor.5.Therewasmuchnoiseupstairs,sothemandownstairsfounditdifficult______(get)tosleep.6.Weareproud_______(be)membersofthisteam.7.Thepatientopenedhismouthasif_________(say)somethingtohisson,buthewastooweaktosayanything.togettobetosaytolearn8.Thegoalofthisactivityis_________(meet)theneedsofcommonpeople.9.Youwouldmakeagreatmistake_____________________(accept)hisoffer.10.Yourcousinissaid_______________(design)anewcomputerprogram.toaccepttohavedesignedtomeet五.用不定式改写句子1.Thecommandergaveordersthatweshouldcrosstheriver.→Thecommandergaveusorders_________________________________________.

2.Theparentswerepleasedwhentheysawtheirchilddoingsowellatschool.→Theparentswerepleased_________________________________________．tocrosstherivertoseetheirchilddoingsowellatschool3.It'sveryimportantforourworkersinthefuturetolearnaforeignlanguagewell.→__________________________________becomesveryimportantforourworkersinthefuture.4.Theysignedanagreementthattheyshouldexpandthetradebetweenthetwocountries.→Theysignedanagreement___________________________________________________________.Tolearnaforeignlanguagewelltoexpandthetradebetweenthetwocountries5.Ithinkthatitisnecessarytounderstandeachotherwhenyoumakefriends.→Ithink_____________________________isnecessarywhenyoumakefriends.6.Duringaspacewalk,astronautshavetomoveslowlysothattheycankeepthebodiesundercontrol→Duringaspacewalk,astronautshavetomoveslowly_____________________________________.7.Canyoutellmewherewewillholdthemeeting?→Doyouknow______________________________?tounderstandeachothertokeepthebodiesundercontrolwheretoholdthemeetingCompletethepassagewiththecorrectformsoftheverbsinbrackets.Sendingpeopletootherplanetsorevenbeyondthesolarsystemisnotaneasygoal

_________(achieve).One