it用法大全形式宾语形式主语.ppt

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1、㈠1.it作人称代词1.1.it的最基本用法是作人称代词，主要指刚提到的事物，以避免重复:Ningboisabeautifulcity,isn’tit?1.2.也可以指动物或婴儿(未知性别的婴儿或孩子):Isthisyourdog？No,itisn’t.1.3.也可指抽象事物:Itwasagreatsurprisetomewhenhedidathinglikethat．2.非人称代词itit有时并不指具体的东西，而泛指天气、时间、环境等，称为非人称的it：2.1.指天气：Itisalovelyday,isn’tit?Itis

2、abitwindy.2.2.指时间:Itwasnearlymidnightwhenshecameback.2.3.指环境:Itwasveryquietinthecafé.2.4.指距离：Itishalfanhour’swalktothecitycentre.㈠1.it作人称代词Everyoneknowsthat_______isdangeroustoplaywithfire,but_______isdifficultistopreventchildrenfromplayingwithfire.A.it,itB.what,wha

3、tC.it,whatD.what,it㈡.引导词it1.Itis+被强调部分+that...使用该句型有以下几点请注意：①强调句的谓语is或was永远用单数.ItwasyesterdaythatImetyourfatherinthestreet．②不管被强调部分是哪种状语，只能用that连接，不得使用where、when等连词.ItwasinthestreetthatImetyourfatheryesterday．③被强调部分为人时，可用who(主格或宾格)和whom(宾格)代替that，用that也行。1)Itwasyou

4、rfatherthat/whom/whoImetinthestreetyesterday．2)ItwasIthat/whometyourfatherinthestreetyesterday．④强调句中也要注意主谓一致、人称一致和否定转移的问题。Itistheywhoareourfriends．Itwasnotuntilteno'clockthatwegothomelastnight．.it用作形式主语.1it代替主语从句1）Itis+adj.+that从句①Itisclear(obvious，true，possiblecert

5、ain....)that.....“清楚（显然，真的，肯定．．．）”Itisveryclearthathe’sroundandtalllikeatree.②.Itisimportant(necessary，right，strange，natural...)that...that后的从句中要用虚拟语气（should+动词原形），should可以省去，建议记住该句型中的形容词。Itisimportantthatwe(should)learnEnglishwell.2）.Itis+v-ed+that从句①Itissaid(repo

6、rted，learned....)that...据说（据报道，据悉．．．）“。　　ItissaidthathehascometoBeijing.②.Itissuggested(ordered/demanded/insisted/commanded...)that...主句中的过去分词是表示请求，建议，命令等词时，that　后的从句要用虚拟语气（should+动词原形），should可以省；常译为“据建议；有命令．．．）Itissuggestedthatthemeeting(should)beputoff.=Heissaidt

7、ohavecometoBeijing.3）.It+n+that...1.Itisapity(ashame...)that...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。Itisapitythatsuchathing(should)happeninyourclass.Itisapitythatheisill.2.Itistime(abouttime，hightime)that...该句型中that后的从句应该用虚拟语气，值得注意的

8、是常用过去时态表示虚拟．常译为“是（正是）．．．的时侯．．．”/should+原型Itistimethatchildrenwenttobed.Itishightimethatthechildrenshouldgotoschool.3.Itisthefirst(second..