39必修6unit3grammar-it的用法

GrammarTheuseof“it”-------BySelina1.是到戒烟的时候了。（quit)2.让人惊讶的是在我这个年纪我依然这么健康。（Itisamazingthat...)3.一旦你吸烟上了瘾，你会发现要把它戒掉很难。（addict...to;tough)4.青少年要适应新的环境有点难。（adolescent;accustom...to)1.Itistimetoquitsmoking.2.ItisamazingthatatmyageIamstillsofit.3.Onceyouareaddictedtosmoking,youwillfindittoughtogiveitup.4.Itisalittledifficultforadolescentstobecomeaccustomedtoanewenviroment.8.Itislikelythathewillsucceed.1.Itrainsheavily(Itisarainyday).2.Itis20kilometersfromGrandad’shousetoJames’.3.ItisDecember17,2009.4.Itis9o’clockinthemorning.5.It'llbelovelyinthegardentonight．7.Itisnogoodsmoking.真正主语真正主语形式主语形式主语真正主语形式主语Discovering“It”=_______isbad.Tosmoke=______isnogood.Smoking=__________islikely.Thathewillsucceed6.Itisbadtosmoke.天气距离日期时间环境Readandanalyzethefollowingsentences.S1.Whatisthis?Itisacellphone.S2.Whatisthat?Itishisdictionary.S3.Whosebookisthis?ItisMrCheng’s.S4.WhereisyourEnglishbook?Itishere.S5.Mycatismissing,Ican’tfinditanywhere.Question:Whatdoes“it”inthesesentencesreferto?Drawaconclusion:it---词性?______可以用作人称代词，代指___________________还可以替代指示代词_____或______.Pron.前文提到的事物.that.this.Readandanalyzethefollowingsentences.ItisFridaytoday.ItwasverycoldlastMonday.Itisabout8:30now.Itisabout25kmfromLongxiantoBazi.ItliesinthesouthofShaoguancity.Itis40°C!Yougotahighfever!Question:Whatdoes“it”inthesesentencesreferto?Conclusion:it可以用作非人称代词，表示_____,_____,______,______,______,_____等。DateweathertimedistanceplaceTemperature日期天气时间距离地点温度Readandanalyzethefollowingsentences.Itisobviousthatthewaterwastoblame.Itistruethathewilltreatmeforbreakfasttomorrow.Itiscertainthatourclasswilldoagoodjobinthefinalexam.Isitpossiblethathewillbecomethechairmanofourcountry?ItisamazingthatatmyageIstilllooklikeastudent!分析：it是______,句子真正的主语是——____________形式主语that引导的主语从句Itis+adj.+that从句跟踪训练1：Itis+adj.+that从句很明显他已经知道了那个坏消息。姚明篮球比易建联打得好是肯定的。Itisobviousthathehasknownthebadnews.ItiscertainthatYaomingplaysbasketballbetterthanYijianlian.1.Itwasurgentthathe_________herimmediately.A.callsB.calledC.callD.wouldcall2.Itisstrangethatsuchathing___inyourschool.A.willhappenB.happensC.shouldhappenD.happenedItisstrangethat_______________________.他居然会这样说，真是奇怪。Itisagreatpitythat___________________.他居然会这样想，真是一件憾事。Itisnaturalthat___________________________.鸟在树上安歇是很自然的。Itisnecessarythat___________________________.有必要立即派他去北京。It’snecessary/strange/natural/important/pity/nowonder/impossible+thatClause从句中的动词要用虚拟,即(should)+动词原形he(should)saysohe(should)thinksoabird(should)restintreeshebesenttoBeijingrightawayReadandanalyzethefollowingsentences.S1.Itisnoteasytostopsmoking.(Text,webpage,line1)S2.Itwasdifficulttoquit.(Text,letter,line19)在S1与S2中，it的作用是_________,真正主语是_____________.S3.Itisnogoodcryingoverspiltmilk.S4.Itisnousecastingpearlsbeforeswine.在S3与S4中，it的作用是_________,真正主语是_____________.构成如下结构：Itis+nouse/nogood/notanygood/notanyuse+doingsth.其含义是？？形式主语不定式短语动名词短语形式主语跟踪练习2：在一个小时内完成任务是不可能的。学好英语要花很长时间。对我来说回答这个问题很难。你没有参加这个聚会是个遗憾。Itisimpossibletofinishthetaskinanhour.IttakeslongtimetolearnEnglishwell.Itisdifficultformetoanswerthisquestion.Itisapitythatyoudidnottakepartintheparty.小结：it做形式主语It可以在句中充当形式主语，真正主语可以由______引导的主语从句充当，还可以由______以及_________短语充当。that不定式动名词…possibleItis/was+adj.necessary+important……one’sdutyIt+is/was+n.one’shope+anhonour……saidItis/was+p.p.knownbelieved…that从句(forsb.)todosth.+that-clause(for/ofsb.)todosththat从句It+be+…nogood/nouse…+doingItseems/happens/matters/…+从句Itissaidthat…据说……Itisreportedthat…Itissupposedthat…Itishopedthat…Itiswellknownthat…据报导……据推测……希望……众所周知……普遍认为……有人建议……Itissaid(reported....)that...Itissuggestedthat…Itisgenerallyconsideredthat…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。1.吸烟危害健康，这是事实。2.碰巧我们在同一间大学。3.据说日本发生了地震。4.劝他戒烟实在浪费时间。Itisafactthatsmokingdoesharmtohealth.Ithappensthatweareinthesamecollege.__________thereisanearthquakeinJapan.Itisawasteoftime_______(try)topersuadehimtogiveupsmoking.tryingItissaidthatReadandanalyzethefollowingsentences.S1.Amousebarkedlikeadoganddroveacataway,sohesaidtohisson“Ithinkitimportanttolearnaforeignlanguage.”S2.Wethinkitourdutytocleanourclassroomeveryday.分析：S1与S2句型中的it是____________,真正宾语是___________.建议用6123结构来记忆该结构。形式宾语不定式短语6123结构Wethinkitourdutytocleanourclassroomeveryday.Ibelieveitimportantkeepingnotes.Hefounditdifficultthathewouldfinishthetaskinanhour.6---主句常用的6个动词---think,believe,make,find,consider,feel.1---形式宾语it2---紧跟在it后的宾语补足语，有两种形式，形容词或者名词。3---真正宾语的三种形式：不定式短语；动名词短语；that引导的宾语从句。跟踪练习3.用形式宾语造句don’tyouthink/useful/tolearnaforeignlanguage/wethink/necessary/topracticeoralEnglish/everyday/Don’tyouthinkitusefultolearnaforeignlanguage?WethinkitnecessarytopracticeoralEnglisheveryday.thestudents/consider/nouse/readingaloud/inthemorning/hemade/certain/shehadgoneabroad/Thestudentsconsideritnousereadingaloudinthemorning.Hemadeitcertainthatshehadgoneabroad.Itis/was+被强调部分+who(whom)/that+其他部分It用于强调句Eg:NancysawyoursisterinTokyoatsix.ItwasNancywhosawyoursisterinTokyolastweek.Itwasyoursisterwho/whomNancysawinTokyolastweek.ItwasinTokyothatNancysawyoursisterlastweek.ItwasatsixthatNancysawyoursisterinTokyo.强调句型的判断将“