高中英语语法之it形式主语.ppt

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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..

2、..)that.....②.Itisimportant(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.Itisn

3、aturalthathefallinlovewithsuchabeautifulgirl.6.It'sstrangethathefeelsoangry.2）Itis+v-ed+that从句ItissaidthatAndyLauwillcometoGuangzhoutomorrow.Itwasreportedthattherewere300peoplediedofthisdisease.ItisknownthatChangjiangRiveristhesecondlongestriverintheworld.Itwassuggested

4、thatthesportsmeetbeputoffuntilnextSaturday.Itisdesiredthatwe(should)geteverythingreadybytonight.Itwasorderedthatthemedicinebesenttherebyplane.3）Itisapity(ashame,nowonder,better)that....Itisapitythatwedidn'tgraspthatopportunity.Itwasagreatpitythatyou(should)havemadesoman

5、ymistakesinyourmathexercise.Itwillbebetterthatshestaywithhergrandmother.Ithappens(seems，looks，appears)that...Ithappened(sohappened)thathemethisteacherinthestreet.Ithappenedthatherparentswerebothout.Ithappenedthattheharvestwasbadthatyear.IthappenedthatIhaddriventhatkindo

6、fcarbefore.IthappenedthatIwasstandingnexttohimwhenhecollapsed.Itseemsthatsheisverysad.it用作形式主语,指代从句1)Itis+adj.+that从句①Itisclear(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①I

7、tissaid(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语气（should+动词原形）4)Ithappens(seems，looks，appears)that...5).①Itistime(abouttime，hightime)that...虚拟语气②Itisthefirst(second...

8、)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