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1、it的用法总结it的用法及其句型和固定搭配，是英语语法的重点，也是近几年考试的热点，因此同学们在学习时应给予足够的重视。现在我们将it的用法归纳如下：请观察以下句子，看看各句中的it各指代什么，有何共同特征？1.Lifeislikeafire;itbeginsinsmoke,andendsinashes.2.Shedidn’tcomeyesterday,anditmeantthatshewasangry.3.Ican’tbelieveit!4.—Whoisknockingatthedoor?—It’sme.5.Itisratherwi
2、ndyatseasometimes.6.ItisthousandsofmilesfromGambiatoAmerica.7.Itwasmidnightwhenheheardamancryingsoftly.8.Itisnevertoolatetomend.9.Itisnousetalkingtothem.10.Itissaidthathestolethemoney.11.IthinkitdifficulttolearnEnglishwell.12.Wemakeitclearthatspeakingtotheteacherinthatw
3、ayisnotpolite.13.Idon’tlikeitwhenpeopletalkwiththemouthfulloffood.14.ItwasinthestreetthatImetherfather.15.ItwasnotuntilshetookoffherdarkglassesthatIrealizedshewasafamousfilmstar.用法归纳：一．用作人称代词，代替前文提到过的事物。如:Thetrainhasarrived.Itarrivedhalfanhourago.二.用以代替指示代词this,that。如:—
4、Whosewatchisthat?—It’smine.三.起指示代词的作用，指一个人或事物。如:—Whoisknockingatthedoor?—It’sme.四.指环境、情况等。如:Itwasverynoisy(quiet)attheverymoment.五.指时间、季节等。如:—Whattimeisit?—It’seighto’clock.六.指距离。如:Itisonlyfivemilesfromheretothehospital.七.指自然现象（天气、气候、明暗等）。如:It’sgettingcold(dark,late,etc
5、.).八.作形式主语。I.it替代作主语的动词不定式的常见句型为：1.Itis+形容词(+ofsb.)+todosth.。形容词必须是能表示逻辑主语sb.特征的形容词。常见的有:bad,brave,careless,clever,cruel,foolish,,honest,horrible,kind,lazy,modest,naughty,,polite,rude,silly,stupid,wise,等。Eg:Itisbraveofhertogohomealoneatnight.2.Itis+形容词(forsb.)todosth.
6、 该句型与上一个同属一个句型。形容词通常表示某事的重要性，紧迫性，难易，安全等情况。常见的形容词有：①important,necessary,natural ②easy,safe,common,normal,hard,difficult,dangerous,unusual, impossible,pleasant等。如：Itisimportantforhertocometotheparty.3。Ittakessb.…todosth.常译为“做……要花费某人……”。 eg:Ittookthousandsofpeoplemanyyear
7、stobuildtheGreatWall. II.it替代作主语的动词-ing形式的常见句型为：Itisnouse/good+doingsth.It”s(well)worthdoingsth.。如：It’snousetalkingtohimaboutit.III.it替代作主语的从句的常见句型为：A.Itis+名词+从句。Itisnowonder/apity/ashame/one’sduty..+that...(难怪/真可惜/真可耻……)。如：Itisnowonderthatshewassoangry.It’sourdutythat
8、weprotecttheenvironment.B.Itis+形容词+从句。形容词有：important，necessary,right,strange,…如：Itisnaturalthathe（should）sayso
