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1、“It”用法及其句型和固定搭配讲解 "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，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 (
2、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,impolite,clear,obvious,certain,suitable,proper,fit,useful,useless,dangerous…
3、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,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‘sn
4、ogood/usedoing… It‘s(well)worthdoing… It‘s(well)worthone‘swhiledoing/todo… It‘s(well)worthwhiledoing/todo 例It‘snousecryingoverspiltmilk. 2.It替代作主语的从句常见句型 (1)Itis+noun+从句 例Itisnosecretthatthepresidentwantstohaveasecondtermatoffice. (2)Itisadj.+clause It‘ssurprisingthat…(should
5、)………竟然…… It‘sapity/shamethat…(should)………竟然…… 例It‘simportantthatyoushouldapologizetoherforyourrudeness.(=It‘sofmuchimportancethatyoushouldapologizetoherforyourrudeness.) (3)Itverbsb.+clause=Itisv-ing+clause It+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze /bother
6、/concern/frighten/please/angersb.that… 例Itworriedmethatshedrovesofast.(=Itwasworryingthatshedrovesofast.) (4)Itverb(tosb.)that…=sb/sthverbtodo (verb=appear,seem,comeabout,emerge,follow,chance,happen,occur,transpire,turnout,workout) 例It(so)happened/chancedthattheywereout.(=Theyhap
7、pened/chancedtobeout.) (5)Itisv-edthat…=sb/sthistodo (verb=say,report,think,believe,hope,expect,agree,accept,decide,determine,intend,plan,understand,know） 例Itissaidthatthecouplehavegottendivorced.(=Thecouplearesaidtohavegottendivorced.) (6)Itisv-edthat…(should)… (verb=demand,req
8、uest,require
