Unit2HealthyLifestyleDiscoverusefulstructures课件高二英语人教版选择性

DiscoveringusefulstructuresTheinfinitiveoftheverbusedasthesubjectOliviaUnit2HealthyLifestyleInthisclass,youwill1.

identifythefunctionsandmeaningsoftheto-infinitivesusedassubjects;2.usetheto-infinitiveassubjectsproperly

inrealcontexts.1.能在健康生活方式的主题语境中，识别和理解不定式作主语的功能和意义；2.运用动词不定式和与健康生活方式相关的主题词汇进行表达。LearningObjectives1.Tochangebadhabitsisnevereasy.2.Ittookthesurgeonthreehourstofinishmymother’slungsurgery.3.TojointhePeople’sLiberation(n.解放)Army,itisrequiredformentoshaveofftheirbeards.4.Itwasnotpolitetodisturbyourneighbourswithloudmusiclastnight.Activity1:Lookatthefollowingsentencesandpayattentiontotheitalicisedinfinitives.Inpairs,discusstheirmeaningsandfunctions.主语subject形式主语

formalsubjectTip1：将形式主语______置于句首，____________置于句末，可以避免句子头重脚轻、结构失衡。it动词不定式四个句子中的不定式都充当主语。用形式主语it代替真正的主语tochangebadhabits符合英语表达习惯，避免句子头重脚轻、结构失衡。如果作者有意将比较长的不定式主语放在句首，那么作者就是想要突出不定式的内容。1.It

isnevereasytochangebadhabits.2.Ittookthesurgeonthreehourstofinishmymother’slungsurgery.3.Tojoin

thePeople’sLiberationArmy,itis

requiredformentoshaveoff

theirbeards.4.It

wasnotpolite

todisturb

yourneighbourswithloudmusiclastnight.1.Ittakessb.+sometime+todo2.

It+be+adj.+for/ofsb.+todoreadthesentencesagainandworkoutthestructure◎It+be+adj.+for/ofsb.+todoItis＋adj.

＋forsb.todosth.常用于表示事物的特征，用于此句型的形容词有：easy,hard,difficult,possible,important,impossible,necessary,good,bad,exciting,interesting,surprising等。Itis＋adj.＋ofsb.＋todosth.表语常为表示人的性格、品质的形容词，句中用of。如good,kind,nice,foolish,polite,ever,careless等。1.However,duringthisperiod,itcanbeeasyforsomeofthemtoformbadhabits.2.Topreventharmfulhabitslikethesefromdominatingateenager’slife

isessential.3.Tochangebadhabitsisnevereasy,evenwithmanyattempts.4.Afterall,itisnoteasytobreakbadhabits.Activity2:Find

moreinfinitivesassubjectsinthereadingpassage.Thendiscusstheirmeaningsandfunctionsingroups.Activity2:Jointhewordstomakefullsentences,andthenjointhe

sentencestomakeaparagraph.Youcanaddyourown

sentencesifnecessarytomakeyourparagraphmore

meaningful.Example:1.important/avoid

/passivecigarettesmoking

Itisimportanttoavoidpassivecigarettesmoking.Ittakessb.+sometime+todoIt+be+adj.+for/ofsb.+todo2.willtake/nutritionspecialist/abalanceddietmenu/make/anhour/

foryou_____________________________________________________________3.useful/turnto/fitnessconsultant/foradvice_____________________________________________________________4.illegal/dangerous/take/drugs_____________________________________________________________5.harmful/skipbreakfast/often_____________________________________________________________Itwilltakenutritionspecialistanhourtomakeabalanceddietmenuforyou.Itisusefultoturntofitnessconsultantforadvice.Itisillegalanddangeroustotakedrugs.Itisharmfultooftenskipbreakfast.Activity3:Completetheconversationswiththecorrectformsofthephrasesinthebox.1A:Hello,doctor.Iwanttoloseweight,butIjustcan’tseemtodoit.WhatcanyoudotohelpmeB:Well,first,it’snecessaryto_____________whatyoueat.Cutoutallfattyfoodandsugarydrinks,andeatmorefruitandvegetables.2A:Ireallyneedto_________awaytoexercisemore.Icoulduseafitnessapp,butmyphone’sfull.B:Sodeleteafewfiles.I'msuretheappdoesn'ttakeupmuchspace.beincontrolofdecideonbeginwith beincontrolof makeachoicedecideon makeupone’smind3A:Beforeexercising,alwaysdoafewwarm-upsto__________.B:Iknow.ButthenIalwaysfeeltootiredtocontinue!4A:ShouldIgoforthepizzaorthefriedchickenIhate______________likethese.Youknowwhat—I'mgoingtoeatboth!B:Wow!Don’teattoomuchjunkfood—you’llgetfat.I’veactually________________togoonadiet,soI’lljuststicktothefruitsal