Unit2HealthyLifestyleDiscoverUsefulStructures课件高中英语人教版选择性

InfinitivesasSubjectDiscoverUsefulStructuresUnit2HEALTHYLIFESTYLELearningObjectives1.mastertheusageoftheinfinitiveasthesubject.2.usetherelevantgrammarflexiblyandauthenticallyinrealsituations.3.understandthedifferencebetweentheinfinitiveasthesubjectandthev.-ingformasthesubject.Revision不定式的形式1.基本形式：

to+动词原形2.其否定形式是:

not

todo.

主动语态

被动语态一般式进行式完成式完成进行式

todo

tobedone

tobedoing

tohavedone

tohavebeendone

tohavebeendoingLeadinginWatchandthinkWatchashortvidoe,andpayattentiontowhattheysay.WarmingupIt’sdifficultformetogetupearly.Togetupearlyisdifficultforme.主语InfinitiveasSubjectReadandObservePayattentiontotheitalicizedinfinitivesanddiscussthemeaningsandfunctionsoftheitalicisedinfinitives.1.Tochangebadhabits

isnevereasy.2.Ittookthesurgeonthreehourstofinishmymother’slungsurgery.3.TojointhePeople’sLiberationArmy,itisrequiredformentoshaveofftheirbeards.4.Itwasnotpolitetodisturbyourneighborswithloudmusiclastnight.主语主语主语主语动词不定式（短语）作主语直接放在________作主语；为了保持句子平衡，用________作形式主语，放在句首，把真正的主语—动词不定式置于句后；和_________构成“疑问词+todo”短语作主语。句首it疑问词Couldyoufindmoreinfinitivesinthereadingpassage?1.However,duringthisperiod,itcanbeeasyforsomeofthemtoformbadhabits.2.Topreventharmfulhabitslikethesefromdominatingateenager’slifeisessential.3.Tochangebadhabitsisnevereasy,evenwithmanyattempts.4.Afterall,itisnoteasytobreakbadhabits.PresentationObserve

Tosee

istobelieve.Togetgoodgradesrequiresalotofhardwork.Tolearnaskillisveryimportantforeveryoneinsociety

Discover1.不定式作主语通常位于______，表示具体的某次动作，谓语动词用______。句首单数PresentationObserve

Itisinteresting

toplaywithsnowinwinter.It’simportantforus

tokeepthewaterclean.It’sverykindofyoutohelpme.Discover以上句子的表语都是______。形容词it+be+adj+(逻辑主语)+todosthPresentation2.当主语较长，谓语较短时，常用it作形式主语放在句首，而将真正的主语—不定式放到谓语的后面。It

isnotrightforpeoplewiththevirus

togotopublicplaces.Itwasnotpolitetodisturb

yourneighbourswithloudmusiclastnight.TojointhePeople’sLiberationArmy,itisaruleformen

toshaveoff

theirbeards.Ittookthesurgeonthreehourstofinishmymother’slungsurgery.

PresentationItisnecessaryforyoutochangeyourjob.It’sdifficultforustolearnEnglishwell.Itwassillyofyoutogiveupsuchagoodchance!It’sverykindofyoutosayso.若adj.“描述人的品格、特点”,用of,如kind, nice, wise, silly, polite, impolite, friendly, foolish, clever;若adj.“描述事或行为的特征”,用for,如easy, hard, difficult, possible, important, impossible, necessary,good, 

bad, exciting, interesting, surprising常用句型1：Itis+adj.+for/ofsb+todosthPresentation常见的名词有：pity, shame, pleasure, one’sduty, one’sjob, fun, joy, goodmanners, badmanners等Summary

常用句型2：Itis+n.+(forsb.)todosth.Itisanhonourtogiveaspeechinbehalfofmyschool.Itisapitytomissthechancetoseeyourshow.

Itisourdutytodothat.PresentationIttookmemorethananhourtodomyhomeworkyesterdayevening.Itwilltakeusalotofmoneytobuythathouse.Summary

常用句型3：Ittakes/took/willtakesb.sometime/moneytodosth.做某事花费某人多长时间(钱)Presentation3.动词不定式与疑问词who,whom,whose,what,which,when,where,how连用构成不定式短语做主语。Presentation4.补充：不定式短语作独立成分通常位于句首，有时位于句中或句末，要用逗号同其他句子成分隔开

Totellthetruth，Idon’tlikethegiftedactressinthemovie.常用短语

tosumup总而言之 tobebrief简言之totellthetruth说实话 tobeexact确切地说 toconclude总而言之，最后tobefrank坦白地说tobegin/startwith首先 tobehonest说老实话PresentationTosumup/ToconcludeTobebrieftobeexactTobegin/startwithTobehonestPresentation

Tolookafterchildrenisherjobtoday.她今天的工作是看孩子。Lookingafterchildrenisherwork.她的工作是照顾孩子。Comparethetwosentencesbelowandtellthedifferenceinmeaning.Summary不定式作主语和动词-ing形式作主语的区别：

5.动名词作主语表示_______________的行为;不定式作主语表示_________________________

动作。经常性或习惯性具体的、一次性的或将来的1.______(do)morningexercisesregularlyisgoodforyourhealth.

2.Itfeelsreallygood______(do)morningexercisestoday.DoingtodoPracticeJointhewordstomakefullsentences.1.important/avoid

/passivecigarettesmokingItisimportanttoavoidpassivecigarettesmoking.2.willtake/nutritionspecialist/abalanceddietmenu/make/anhour/

foryou____________________________________________________________3.useful/turnto/fitnessconsultant/foradvice____________________________________________________________4.illegal/dangerous/take/drugs____________________________________________________________5.harmful/skipbreakfast/often____________________________________________________________Itwilltakenutritionspecialistanhourtomakeabalanceddietmenuforyou.Itisusefultoturntofitnessconsultantforadvice.Itisillegalanddangeroustotakedrugs.Itisharmfultoskipbreakfastoften.Completetheconversationswiththecorrectformsofthephrasesinthebox.A:Hello,doctor.Iwanttoloseweight,butIjustcan’tseemtodoit.

Whatcanyoudotohelpme?B:Well,first,it’snecessaryto_____________whatyoueat.Cutoutall

fattyfoodandsugarydrinks,andeatmorefruitandvegetables.A:Ireallyneedto

________awaytoexercisemore.Icouldusea

fitnessapp,butmyphone’sfull.B.Sodeleteafewfiles.I'msuretheappdoesn'ttakeupmuchspace.decideonbeginwithbeincontrolofmakeachoicedecideonmakeupone’smindbeincontrolofPracticePracticeA:Beforeexercising,alwaysdoafewwarm-upsto___________B:Iknow.ButthenIalwaysfeeltootiredtocontinue!A:ShouldIgoforthepizzaorthefriedchicken?Ihate_____________

likethese.Youknowwhat—I'mgoingtoeatboth!B:Wow!Don’teattoomuchjunkfood—you’llgetfat.I’veactually________________togoonadiet,so

I’lljuststicktothef