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1、It用作形式主語替代作主語的從句、動詞不定式、動名詞，而把真正作主語的從句、動詞不定式、動名詞置于句尾。It作形式主語的常見句型：1.代作主語的動詞不定式，其句型為（1）Itbeadj.（forsb.）todosth.此處adj.通常為描述事件的形容詞：easy，difficult，hard，necessary，unnecessary，possible，impossible，likely，unlikely，right，wrong，important，unimportant，legal，illegal，well-mannered，ill-mannered，polite，impolite
2、，clear，obvious，certain，suitable，proper，fit，useful，useless，dangerous…例Itisillegal（forateenager）todriveacarwithoutalicense.（2）Itbeadj.ofsb.todosth.此處adj.通常為描述人的形容詞：kind，unkind，nice，rude，cruel，considerate，thoughtful，thoughtless，careful，careless，silly，foolish，stupid，clever，wise，crazy.例It'skindofyou
3、tohelpmewiththeproblem.（3）It替代作主語的動名詞的常見句型It'snogood/usedoing…It's（well）worthdoing…It's（well）worthone'swhiledoing/todo…It's（well）worthwhiledoing/todo例It'snousecryingoverspiltmilk.2.It替代作主語的從句常見句型（1）Itis+名詞+從句Itisnosecretthatthepresidentwantstohaveasecondtermatoffice.It'sapity/shamethat…（should）
4、………竟然……（2）Itis形容詞+clause能用于這個句型的形容詞有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probable、impossible等。It'ssurprisingthat…（should）………竟然……例It'simportantthatyoushouldapologizetoherforyourrudeness.（=It'sofmuchimportancethatyoushouldapologizetoh
5、erforyourrudeness.）（3）It動詞sb.+clause=Itisv-ing+clauseIt+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/concern/frighten/please/angersb.that…Itworriedmethatshedrovesofast.（=Itwasworryingthatshedrovesofast.）（4）Itverb（tosb.）that…=sb/sthverbtodo（verb=appear，seem，comeabout，eme
6、rge，follow，chance，happen，occur，transpire，turnout，workout）It（so）happened/chancedthattheywereout.（=Theyhappened/chancedtobeout.）（5）Itis過去分詞that…=sb/sthistodo（verb=say，report，think，believe，hope，expect，agree，accept，decide，determine，intend，plan，understand，know）例Itissaidthatthecouplehavegottendivorce
7、d.（=Thecouplearesaidtohavegottendivorced.）（6）Itisv-edthat…（should）…（verb=demand，request，require，order，suggest，advise，recommend例Itissuggestedthattheyshouldbeginwiththethirdquestion.三、It作主語的其它句型1.Ittakessb.…todo…（=sbtakes…todo…）某人用多
