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1、It的用法及句型总结来源：网络资源作者：时间：2009-07-23点击：505"It"用法及其句型和固定搭配，是高中英语语法的重点、难点，又是近几年高考的热点，因此应给予充分的重视，现将it用法归纳如下：一、It用作实词表达以下概念:指代前文提到的事物，如前文中的this,that；替代前文中的内容；指代一位性别不明的小孩或未知的人；指代未指明但谈话双方都知道的那件事；指代时间、天气、气候、距离等自然现象……二、It用作形式主语替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定
2、式、动名词置于句尾。 It作形式主语的常见句型：1.代作主语的动词不定式，其句型为:(1)Itbeadj.(forsb.)todosth.此处adj.通常为描述事件的形容词：easy,difficult,hard,necessary,unnecessary,possible,impossible,likely,unlikely,right,wrong,important,unimportant,legal,illegal,well-mannered,ill-mannered,polite,imp
3、olite,clear,obvious,certain,suitable,proper,fit,useful,useless,dangerous… 例: Itisillegal(forateenager)todriveacarwithoutalicense.(2)Itbeadj.ofsb.todosth.此处adj.通常为描述人的形容词：kind,unkind,nice,rude,cruel,considerate,thoughtful,thoughtless,careful,careless
4、,silly,foolish,stupid,clever,wise,crazy.例: It'skindofyoutohelpmewiththeproblem. (3)It替代作主语的动名词的常见句型:It'snogood/usedoing… It's(well)worthdoing… It's(well)worthone'swhiledoing/todo…It's(well)worthwhiledoing/todo 例: It'snousecryingo
5、verspiltmilk（覆水难收）.2.It替代作主语的从句常见句型：(1)Itis+noun+从句例: Itisnosecretthatthepresidentwantstohaveasecondtermatoffice. (2)Itisadj.+clauseIt'ssurprisingthat…(should)………竟然……It'sapity/shamethat…(should)………竟然…… 例: It'simportantthatyoushouldapologizetoh
6、erforyourrudeness.(=It'sofmuchimportancethatyoushouldapologizetoherforyourrudeness.)(3)Itverbsb.+clause=Itisv-ing+clauseIt+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze /bother/concern/frighten/please/angersb.that…例:Itworriedmethatsh
7、edrovesofast.(=Itwasworryingthatshedrovesofast.) (4)Itverb(tosb.)that…=sb/sthverbtodo例: It(so)happened/chancedthattheywereout.(=Theyhappened/chancedtobeout.)(5)Itisv-edthat…=sb/sthistodo (verb=say,report,think,believe,hope,expect,agree,accept,decide
8、,determine,intend,plan,understand,know） 例: Itissaidthatthecouplehavegottendivorced.(=Thecouplearesaidtohavegottendivorced.) (6)Itisv-edthat…(should)…(verb=demand,request,require,order,suggest,advise,recommend 例 Itissuggestedthattheyshouldbeginwith
