Unit2HealthyLifestyleDiscoverUsefulStructures课件-高中英语人教版选择性2

Unit2HealthyLifestyleDiscoverusefulstructuresThegreatestwealthishealth. ---VirgilPayattentiontothesentencesLead-inItisdifficultformetogetupearly.Itiskindofyoutohelpme!Lead-in⁎Theinfinitiveineachsentencefunctionsasthesubjectofthesentence.Readthefollowingsentencesandsummarizetherules.1.Tochangebadhabitsisnevereasy.2.Ittookthesurgeonthreehourstofinishmymother’slungsurgery.3.Whenyoumakeupyourmindtochangeabadhabit,itisagoodideatotakesmallsteps.4.Itwasnotpolitetodisturbyourneighborswithloudmusiclastnight.5.Howtopreventharmfulhabitsdisturbsmanyteenagers.todo作主语：1.todo作主语通常位于句首，谓语动词用单数。2.疑问词+to

do作主语。3.当主语较长，谓语较短时，常用形式主语it放在句首,而将真正的主语todo放句尾。It作形式主语的句式如下：Itisnecessary

foryoutochangeyourjob.It’sdifficulttofinishthetaskaheadofschedule.Itwassilly

ofyoutogiveupsuchagoodchance!It’sverykind

ofyoutosayso.Learning若adj.“描述人的品格、特点”,用of,如kind, silly, polite, foolish若adj.“描述事或行为的特征”,用for,如easy, difficult, possible, important, necessary,surprising句型1：Itis+adj.+(for/ofsb)+todosthSummary

Itisnecessary______youngstudentstolearna foreignlanguage.Itwassilly______youtogiveupsuchagoodchance!

Itisimportant_______ustoexpressouropinions.Itwasnotpolite______youtodisturb

yourneighbourswithloudmusiclastnight.5.Itiscareless___metoleavethedooropen,whichinvitedthievesin.forofofShowtimeforof常见的名词有：pity, shame, pleasure, one’sduty, one’sjob，goodmanners, badmanners等LearningSummary

句型2：Itis+n.+(forsb.)todosth.Itisanhonourtogiveaspeechonbehalfofmyschool.Itisapitytomissthechancetoseeyourshow.

Itisourdutytodothat.Ittookmemorethananhourtodomyhomeworkyesterdayevening.Itwilltakeusalotofmoneytobuythathouse.Ittakesthecompanytoomuchenergytomakethecar.LearningSummary

常用句型3：Ittakes/took/willtakesb.time/money/energytodosth.花某人时间/金钱/精力做某事

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

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

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

2.Itfeelsreallygood______(do)morningexercisestoday.Doingtodo在Itis+nouse/nogood/awasteoftime/...句型中常用doing作真正的主语。1.Itisnouse______(cry)overthesplitmilk.覆水难收。2.Itisawasteoftime________(wait)heredoingnothing.3.Itisnogood______(take)thismedicine.

cryingwaitingtakingtodotodo作主语位于句首，在谓语之前todo作主语位于谓语之后，It作形式主语疑问词+todo构成不定式短语，作主语和-ing作主语的区别Toreadwithoutreflectingislikeeatingwithoutdigesting.

Ittakessb.time/moneytodosth.Itis+adj.+（for/ofsb.）todosth.Itis+n.+(forsb.)todosth.todo表示具体的，将来的，一次性的动作-ing表示经常性、习惯性、抽象的动作与疑问词who,whom,whose,what,which,when,where,how等连用Summary5.Ittookusabouttwohours

(get)therethatday.6.Whether

(hold)apartythisweekendhasn’tbeenknownyet.7.Itisfoolish

youtotakeataxitothetowninthatsituation.8.Itisimportantforher

(prepare)fortheexamination.9.It’sourduty

(keep)ourenvironmentcleanandtidy.10.Itisnogoodforyou

(wait)hereforalongtime.togettoholdoftopreparetokeepwaitingPraticeJointhewordstomakefullsentencesusingtheinfinitive.1.important/avoid/passivecigarettesmoking.2.willtake/nutritionspecialist/abalanceddietmenu/make/anhour/foryou.3.useful/turnto/fitnessconsultant/foradvice4.illegal/dangerous/take/drugs5.harmful/skipbreakfast/oftenPractice1.important/avoid/passivecigarettesmoking.Itisimportanttoavoidpassivecigarettesmoking.2.willtake/nutritionspecialist/abalanceddietmenu/make/anhour/foryou.Itwilltakeanutritionspecialistanhourtomakeabalanceddietmenuforyou.3.useful/turnto/fitnessconsultant/foradviceItisusefultoturntofitnessconsultantforadvice.4.illegal/dangerous/take/drugsItisillegalanddangeroustotakedrugs.5.harmful/skipbreakfast/oftenItisharmfultooftenskipbreakfast.Practicecompletetheconversationswiththecorrectformsofthephrasesinthebox.1.A:Hello,doctor.Iwanttoloseweight,butIjustcan'tseemtodoit.WhatcanyoudotohelpmeB:Well,first,it'snecessaryto______________whatyoueat.Cutoutallfattyfoodandsugarydrinks,andeatmorefruitandvegetables.2.A:Ireallyneedto_____________awaytoexercisemore.Icoulduseafitnessapp,butmyphone'sfull.B:Sodeleteafewfiles.I'msuretheappdoesn'ttakeupmuchspace.3A:Beforeexercising,alwaysdoafewwarm-upsto___________________.B:Iknow.ButthenIalwaysfeeltootiredtocontinue!4.A:ShouldIgoforthepizzaorthefriedchickenIhate_________________likethese.Youknowwhat—I'mgoingtoeatboth!B:Wow！lDon'teattoomuchjunkfood-you'llgetfat.I'veactually________________togoonadiet,soI'lljuststicktothefruitsalad.beincontrolofbeginwith