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1、-2.有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。主语从句后的谓语动词一般用单数形式。常用句型如下：（1）It+be+名词+that Eg.Itisapitythatwewontbeabletogotothesouthtospendoursummervacation.Itisstillamysterywhatcausedtheaccident.2）It+be+形容词+that从句Eg.Itiscertainthathewillwinthematch.Itistruethathehasmadeaveryimportantdiscoveryinch
2、emistry.Itisverylikelythattheywillholdameeting.Itisstrangethatheshoulddothat.Itisimportantthatweallshouldattendthemeeting.Itisstrangethatthemanshouldhavestucktohissillyideas.（3）It+be+动词的过去分词+that从句Eg.Itissaidthathehasgonetoshanghai.(=Heissaidtohavegonetoshanghai)Itisknowntoallthatthegunpowderwasfirs
3、tinventedtheChinese.Itissuggestedthatthework（should）bedonewithgreat care.（4）It+不及物动词+that从句Eg.Itseemsthathehasseenthefilm.(=Heseemstohaveseenthefilm)Ithappenedthatthetwocheatswerethere.(=Thetwocheatshappenedtobethere)Itoccurred tomethatIhadforgottentolockmydoor.ItsuddenlyhitmethatIhadforgottentolockmydoor.ItstruckmethatIhadforgottentolockmydoor.Itturnedoutthatnobodyrememberedtheaddress.第 3 页-