it作形式主语备课教案.ppt

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1、以形式主语it引导的句型为避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语。1.Itiscertainthathewillsucceed.2.Itisnotknownwhetherhewillgothere.3.Ithasnotbeendecidedyetwhenthey’llstarttheproject.“It”isusedasemptysubject.形式主语1.Itis＋名词＋从句Itisafactthat…事实是…Itisanhonorthat…非常荣幸Itiscommonknowledgethat…是常识能获邀参加你们的婚礼真是不胜荣幸风就是

2、流动的空气,这是常识可惜他由于一个拼写错误没有得满分It’sagreathonorthatIhavebeeninvitedtoyourwedding.It’scommonknowledgethatwindismoving/flowingair.It’sapitythathedidn’tgetfullmarksbecauseofaspellingmistake.句型1.2.Itis+adj.+从句It’scertainthat…肯定…Itispossiblethat...很可能……Itisunlikelythat...不可能……Itisobviousthat…很明显…Itisneces

3、saryimportantatural...that…*_________________(很可能)shewillcomebacktomorrow.*_________________(很明显)thismeasureiseffective.+(should)+do…ItispossiblethatItisobviousthat句型2.另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should)+do”，常用的句型有：Itisnecessary(important,natural,strange,etc.)that…Itissugges

4、ted(requested,proposed,desired,etc.)that…3.Ithappens(seems,looks,appears)that...该句型中it是形式主语，that引导的是主语从句,主句中的happen,seem等词是不及物动词．Ithappened(sohappened)thathemethisteacherinthestreet.碰巧　Itseemsthathewillbebackinafewdays.句型3.It seems that sb. do/ be doing/ have done/ had done= Sb. seems to do/ b

5、e doing/ have done/to be done/to have beenIt seemed thathe had been to Beijing before.=He seemedtohave been to Beijing before.It+不及物动词+从句Ithappenedthat...碰巧……Itoccurredtomethat…我突然想起…*________________(刚好)Icameintotheofficeatthattime.*____________________(我突然想起)Iforgettosenttheletter.Ithappenedt

6、hatItoccurredtomethat句型4.据说他读过这篇小说.It was said thathe had read this novel.=Hewas saidtohave read this novel.It+be+-ed分词+that-从句Itissaidthat……据说……Itisknownthat……据了解……Itisreportedthat……据报道……Itisbelievedthat……据认为……据说她两年前在美国留学It’ssaidthathestudiedinAmericatwoyearsago2.据说她现在正在美国留学It’ssaidthatheisnow

7、studyinginAmerica3.据说她现在懂三国外语It’ssaidthatheknowsthreeforeignlanguagesHeissaidtohavestudiedinAmericatwoyearsago.HeissaidtobestudyinginAmericanow.Heissaidtoknowthreeforeignlanguages.Itissuggested(ordered,required...)that...该句型和上一个同属