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It用作形式主语的常见句型这样就构成了下面一些常用句型:1)Itis+n.+thatItisapity/shamethat...可惜的是……Itisasurprisethat…令人吃惊的是…Itisafactthat…事实是…Itiscommonknowledgethat……是常识*_______________(很可惜)welostthematch.*______________(这是事实)hecheatedintheexam.ItisapitythatItisafactthat1.令人吃惊的是他改变了主意。Itisasurprisethathechangedhismind.2.真可惜你错过了这么一个好机会。Itisapitythatyoumissedsuchagoodchance.3.事实是我们周围的污染正变得越来越严重。Itisafactthatthepollutionaroundusisbecomingmoreandmoreserious.2)Itis+adj.+thatIt’scertainthat…肯定…Itispossible/likelythat...很可能……Itisobvious/clearthat…很明显…Itistruethat…的确…Itisnecessary\important\natural\...that…*_______________(很可能)shewillcomebacktomorrow.*_______________(很明显)heisanEnglish.+(should)+do…ItispossiblethatItisobviousthat1.很可能他会申请这项工作的。Itislikelythathewillapplyforthejob.2.的确我犯了个错误。ItistruethatImadeamistake.3.有必要我们要学习英语。ItisnecessarythatweshouldlearnEnglish.3)It+不及物动词+thatIthappenedthat...碰巧……Itoccurredtomethat…我突然想起…Itappears/seemsthat…似乎，好像…Itturnedoutthat…原来…*________________(刚好)Iwasoutyesterday.*____________________(我突然想起)Iforgottosenttheletter.IthappenedthatItoccurredtomethat1.好像是我错了。ItappearsthatIamwrong.2.碰巧他得去参加一个会议。Ithappenedthathehadtoattendameeting.3.我突然想起他会说英语。ItoccurstomethathecanspeakEnglish.4.原来他是Mary的朋友。ItturnedoutthathewasMary’sfriend.4)It+be+过去分词+从句Itissaidthat...据说……Itisknowntoallthat...众所周知……Itisreportedthat...据报道……Itisbelievedthat...据相信……;人们相信……Itissuggestedthat+(should）do...建议……*_________________(据报道)20peoplewerekilledintheaccident.*__________________(建议)weshouldeatmorevegetableanddomoreexercise.ItisreportedthatItissuggestedthat