it用法及引导的重点句型

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1、06届高三第二轮复习07高考英语第一轮复习it用法归纳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,

2、isn’tit?Itisabitwindy.2.2.指时间:Itwasnearlymidnightwhenshecameback.2.3.指环境:Itwasveryquietinthecafé.2.4.指距离：Itishalfanhour’swalktothecitycentre.3.it的其他用法3.1.表示谁在做某事的句子：Whoisit?---It’sme.Herfacelightedwhenshesawwhoitwas.3.2.用来泛指某件事：Soyouaregoingtobemarriedthistime？Whenisit？Itdoes

3、n’tmatter.Itisashame,isn’tit?㈡.it的重要句型1.Itis+被强调部分+that...该句型是强调句型。将被强调的部分放在前面，其它部分置于that之后，被强调部分可以是主语，宾语，表语或状语，强调的主语如果是人，that可以由who换用。如果把这种句型结构划掉后，应该是一个完整无缺的句子；这也是判断强调句型与其它从句的方法。强调句型It+be+被强调部分+that/who从句ImetTomintheparkyesterday.1)ItwasIwhometTomintheparkyesterday.2)ItwasTomwh

4、oImetintheparkyesterday.3)ItwasintheparkthatImetTomyesterday.4)ItwasyesterdaythatImetTominthepark.Itwasfiveo’clock_________Igothome.Itwasatfiveo’clock_______Igothome.whenthat1)Hedidn’tcomebecausehewasill.Itwasbecausehewasillthathedidn’tcome.2)Shedidn’tgotobeduntilherfathercamebac

5、k.Itwasuntilherfathercamebackthatshedidn’tgotobed.(wrong)Notuntilherfathercamebackdidshegotobed.Itwasnotuntilherfathercamebackthatshewenttobed.2.Itisnotuntil+被强调部分+that...该句型也是强调句型。主要用于强凋时间状语，译成汉语＂直到．．．才．．．＂，可以说是not...until...的强调形式。ItwasnotuntilshetookoffherdarkglassesthatIrealiz

6、edshewasafamousfilmstar.=NotuntilshetookoffherdarkglassesdidIrealizeshewasafamousfilmstar.=Ididn’trealizeshewasafamousfilmstaruntilshetookoffherdarkglasses.3.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。Iti

7、sveryclearthathe’sroundandtalllikeatree.=Thathe’sroundandtalllikeatreeisveryclear.4.Itisimportant(necessary，right，strange，natural...)that...该句型和上一个同属一个句型；由于主句中的形容词不同，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.Itisnecessarythat

8、he(should)rememberthesewords.5.Itissaid(