高中英语语法之it形式主语

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1、Theuseof"it"第一节形式主语It作形式主语替代that从句1）Itis+adj.+that从句2）Itis+v-ed+that从句3）Itisapity(ashame...)that...4）Ithappens(seems，looks，appears)that...5）Itistime(abouttime，hightime)that...Itisthefirst(second...)timethat...1）Itis+adj.+that从句①Itisclear(obvious，true，possiblecertain....)that.....②.Itisimporta

2、nt(necessary，right，strange，natural...)that...从句中要用虚拟语气（should+v.原形）1.ItisimportantthatstudentstodaymasterEnglish.2.Itisperfectthatyoucancometomybirhtdayparty.3.Itisobviousthatweneedmorepractice.4.Itisstrangethathe(should)havemadeamistake.5.Itisnaturalthathefallinlovewithsuchabeautifulgirl.6.It'

3、sstrangethathefeelsoangry.2）Itis+v-ed+that从句ItissaidthatAndyLauwillcometoGuangzhoutomorrow.Itwasreportedthattherewere300peoplediedofthisdisease.ItisknownthatChangjiangRiveristhesecondlongestriverintheworld.ItwassuggestedthatthesportsmeetbeputoffuntilnextSaturday.Itisdesiredthatwe(should)getever

4、ythingreadybytonight.Itwasorderedthatthemedicinebesenttherebyplane.3）Itisapity(ashame,nowonder,better)that....Itisapitythatwedidn'tgraspthatopportunity.Itwasagreatpitythatyou(should)havemadesomanymistakesinyourmathexercise.Itwillbebetterthatshestaywithhergrandmother.Ithappens(seems，looks，appear

5、s)that...Ithappened(sohappened)thathemethisteacherinthestreet.Ithappenedthatherparentswerebothout.Ithappenedthattheharvestwasbadthatyear.IthappenedthatIhaddriventhatkindofcarbefore.IthappenedthatIwasstandingnexttohimwhenhecollapsed.Itseemsthatsheisverysad.it用作形式主语,指代从句1)Itis+adj.+that从句①Itiscle

6、ar(obvious，true，possiblecertain....)that.....②.Itisimportant(necessary，right，strange，natural...)that...从句中要用虚拟语气（should+v.原形）2)Itis+v-ed+that从句①Itissaid(reported，learned....)that...②.Itissuggested(ordered/demanded/insisted/commanded...)that(should+v.原形)3)Itisapity(ashame...)that...that后的从句一般用虚拟

7、语气（should+动词原形）4)Ithappens(seems，looks，appears)that...5).①Itistime(abouttime，hightime)that...虚拟语气②Itisthefirst(second...)timethat(完成时)1.真可惜，他没来。itisapitythat2.我们爱自己的父母是很自然的。itisnaturalthat3.很明显，他是是个勤奋又上进的人。itisobviousthat4.我恰巧在书店里