Unit2HealthyLifestyleDiscoverUsefulStructures课件高中英语人教版选择性 2.pptx

InfinitivesasSubjectDiscoverUsefulStructuresUnit2HEALTHYLIFESTYLE

LearningObjectives1.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:nottodo.主动语态被动语态一般式进行式完成式完成进行式todotobedonetobedoingtohavedonetohavebeendonetohavebeendoing

LeadinginWatchandthinkWatchashortvidoe,andpayattentiontowhattheysay.

WarmingupIt’sdifficultformetogetupearly.Togetupearlyisdifficultforme.主语InfinitiveasSubject

ReadandObservePayattentiontotheitalicizedinfinitivesanddiscussthemeaningsandfunctionsoftheitalicisedinfinitives.1.Tochangebadhabitsisnevereasy.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.

PresentationObserveToseeistobelieve.Togetgoodgradesrequiresalotofhardwork.TolearnaskillisveryimportantforeveryoneinsocietyDiscover1.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

PresentationObserveItisinterestingtoplaywithsnowinwinter.It’simportantforustokeepthewaterclean.It’sverykindofyoutohelpme.Discover以上句子的表语都是______。形容词it+be+adj+(逻辑主语)+todosth

Presentation2.当主语较长，谓语较短时，常用it作形