高二英语选修6 Unit3 教案5

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1、教案3Unit3AhealthylifeGrammarTeachingmaterialNSEFCBook6——Unit3TeachingaimsEnablethestudentstomastertheusageofit.Teachingimportant&difficultpointsHowtoenablethestudentstoknowtheusageofit.Teachingaidstaperecorder,slidesTeachingproceduresStep1RevisionCompletethepassagewit

2、hthesuitablewordsintheirproperforms.1.dueto6.stress2.addicted7.quit3.alcohol8.drugs4.manage9.pregnant5.cigarettes10.adolescentsSmoking__________,drinking_______ortakingother__________producemanyharmfuleffectsandhavenorealbenefits.Sowhydo___________doit?Somebeginbecau

3、setheybelieveitmakesthemlookcool.Othersthinkitwillhelpwith_______.Intheirlifepossibly________pressurefromtheirparentsorteachers.10Somejustwanttoseewhatitislike.Whattheydon’trealizeisthattheywillgetintothehabitand__________become____________.Itwillthenbedifficultto___

4、______thehabit.Afewpeople________toquiteasilybutformanyitisaverypainfulprocess.Ofcourse,thebestwaytodealwiththesedrugsisnottostartinthefirstplace.Keys：cigarettes；alcohol；drugs；adolescents；stress；dueto；eventually；addicted;quit；manageStep2LeadinSlideshowDiscovering“It”

5、1．Itrainsheavily.指天气2.Itis20kilometersfromGranddad’shousetoJames’.指距离3.ItisNovember11,2005.指日期4.Itis9o’clockatnight.指时间5.Itisbadtosmoke.形式主语6.Itisnogoodsmoking.形式主语7.Itislikelythathewillsucceed.形式主语Step3Theuseof“it”一、“it”作人称代词1.it的最基本用法是作代词，主要指刚提到的事物，以避免重复:Xi’anis a 

6、beautiful city,isn’t it?Theywatchedthetrainuntilitdisappearedinthedistance.102.也可以指动物或婴儿(未知性别的婴儿或孩子):Isthisyourdog？No,itisn’t.二、it作非人称代词it有时并不指具体的东西，而泛指天气、时间、日期、距离、价值、度量、温度、环境等，称为非人称的it：1.指天气：Itisalovelyday,isn’t it?Itisabitwindy.2.指时间:Itwasnearlymidnightwhenshecameb

7、ack.3.指环境:Itwasveryquietin the café.4.指距离：Itishalfanhour’s walk tothecitycentrefrommyhome.5.指日期：What'sthedatetoday?It'sMay1,2007.6.指季节：Itissummernow.7.指度量：Itisabout5kilograms.8.指价值：----What'sthecostoftheT-shirt?10----Itis150Yuan.三、it用作形式主语替代作主语的从句、动词不定式、动名词，而把真正作主语的从

8、句、动词不定式、动名词置于句尾。1.代作主语的动词不定式，其句型为（1）Itbeadj.（forsb.）todosth.此处adj.通常为描述事件的形容词：easy，difficult，hard，necessary，unnecessary，possible，im