高二英语教案高二英语选修6 Unit3 教案5.docx
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高二英语教案高二英语选修6Unit3教案5
教案3Unit3Ahealthylife
Grammar
Teachingmaterial
NSEFCBook6——Unit3
Teachingaims
Enablethestudentstomastertheusageofit.
Teachingimportant&difficultpoints
Howtoenablethestudentstoknowtheusageofit.
Teachingaids
taperecorder,slides
Teachingprocedures
Step1Revision
Completethepassagewiththesuitablewordsintheirproperforms.
1.dueto6.stress
2.addicted7.quit
3.alcohol8.drugs
4.manage9.pregnant
5.cigarettes10.adolescents
Smoking__________,drinking_______ortakingother__________producemanyharmfuleffectsandhavenorealbenefits.Sowhydo___________doit?
Somebeginbecausetheybelieveitmakesthemlookcool.Othersthinkitwillhelpwith_______.Intheirlifepossibly________pressurefromtheirparentsorteachers.
Somejustwanttoseewhatitislike.Whattheydon’trealizeisthattheywillgetintothehabitand__________become____________.Itwillthenbedifficultto_________thehabit.Afewpeople________toquiteasilybutformanyitisaverypainfulprocess.Ofcourse,thebestwaytodealwiththesedrugsisnottostartinthefirstplace.
Keys:
cigarettes;alcohol;drugs;adolescents;stress;dueto;eventually;addicted;quit;manage
Step2Leadin
Slideshow
Discovering“It”
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 beautiful city,isn’t it?
Theywatchedthetrainuntilitdisappearedinthedistance.
2.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:
Itwasnearlymidnightwhenshecameback.
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?
----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,impossible,likely,unlikely,right,wrong,important,unimportant,legal,illegal,well-mannered,ill-mannered,polite,impolite,clear,obvious,certain,suitable,proper,fit,useful,useless,dangerous…
Itisillegal(forateenager)todriveacarwithoutalicense.
(2)Itbeadj.ofsb.todosth.
此处adj.通常为描述人的形容词:
kind,unkind,nice,rude,cruel,considerate,thoughtful,thoughtless,careful,careless,silly,foolish,stupid,clever,wise,crazy.
It'skindofyoutohelpmewiththeproblem.
(3)It替代作主语的动名词的常见句型
It'snogood/usedoing…
It's(well)worthdoing…
It's(well)worthone'swhiledoing/todo…
It's(well)worthwhiledoing/todo
It'snousecryingoverspiltmilk.
2.作形式主语替代主语从句
1.Itisclear(obvious,true,possible,certain....)that.....
该句型中it是形式主语,真正的主语是that引导的主语从句,常译为“清楚(显然,真的,肯定...)” 是主语从句最常见的一种结构。
例如:
Itisveryclearthathe’sroundandtalllikeatree.
Itisstrangethatithasn’tbeennoticedbefore.真奇怪,它以前没有引起注意。
2.Itisv-edthat…=sb/sthistodo
Itissaid(reported/learned/believed/thought/known/told/hoped.....)that...
该句型中的it仍是形式主语,真正主语是that引导的主语从句;该结构常译为“据说(据报道,据悉...)”。
ItissaidthathehascometoBeijing.
Itisreportedthatanotherearthsatellitehasbeenputintoorbit.
③Itis+noun+从句
Itisapity(ashame/anhonor/agoodthing/afact/asurprise/...)that...
该句型中,that后的从句一般用虚拟语气(should+动词原形),should可省去.表示出乎意料,常译为“竟然”。
没有这种意义时,则不用虚拟语气。
例如:
Itisapitythatsuchathing(should)happeninyourclass.
这种事竟然发生在你们班上,真是遗憾!
Itisapitythatheisill.他生病了,真遗憾!
四、it作形式宾语
当复合宾语中的宾语是不定式、动名词宾语从句时,往往把宾语放在它的补足语后面,而用it作形式宾语,放在宾语补足语之前。
该句型中的it作形式宾语,常用的动词有think,believe,make,find,consider,feel等。
Ithinkitnousearguingwithhim.
我认为和他争吵没有用。
IfounditveryinterestingtostudyEnglish.
我发现学英语非常有趣。
Hemadeitclearthathewasnot
interestedinthissubject.
他非常清楚地表示他对那门学科不感兴趣。
五、用于强调句型
Itis/was +被强调部分+that/who...
Itisnotuntil+被强调部分+that...
ImetTomintheparkyesterday
1)ItwasIwhometTomintheparkyesterday.
2)ItwasTomwhoImetintheparkyesterday.
3)ItwasintheparkthatImetTomyesterday.
4)ItwasyesterdaythatImetTominthepark.
Itwasfiveo’clock_when________Igothome.
Itwasatfiveo’clock_that_____Igothome.
Itwasshewho/thathadbeenwrong.是她错了。
(主语)
Itwasthegirlwhom/thatImetjustnow.我刚才遇见的就是这个女孩。
(宾语)
ItwasTomtowhomtheteacherhadtalked.老师与其谈话的那个人是汤姆。
(介词宾语)
ItwasonMondaynightthatallthishappened.所有这一切就是在星期一的晚上发生的。
(状语)
Itisnotuntil+被强调部分+that...