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《【语法课堂】高中英语语法汇总Ⅱ》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
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，是高屮英语语法的重点、难点，因此应给予充分的重视，今天我们就为大家归纳一下it的用法归纳一下一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、犬气、气候、距离等口然现象。二it作形式主语it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。1.it作形式主语代替从句的句型：(1)It+be+名词词组+that从
2、句。仞J:It"sawonderthatyoucouldfinishthehardtaskinsuchashorttime.(2)It+be+adj.+that从句Itis/wassurprising(important,desirable,advisable---)that…。在这个句型中，从句的谓语动词常用虚拟语气，即“should+动词原形”或“shouldhave+过去分词”。彳列：It'simportantthatyoushouldapologizetoherforyourrudeness-IFsstrangethathes
3、houldhavegoneawaywithouttellingus.(3)It+v.+sb.+that从句It+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/frighten/please/angersb.that...彳列:Itworriedmethatshedrovesofast.(4)Itis/wasdesired(suggested,settled,proposed,requested,decided-••)在这个句型屮，从句的谓语动
4、词常用虚拟语气，即“(should)+动词原形”。例:Itwasrequestedthattheplayshouldbeputonagain.(5)It+be/seem+adj.(good,true,wonderful,wrong,clear,possible,certain…)+that从句例:Itislikelythattheywillbeatustonight.2.it作形式主语代替不定式的句型：(1)It+be+adj.(forsb.)todosth.此处adj.通常为描述事件的形容词：easy,difficult,hard,
5、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...例:Itisillegal(forateenager)todriveacarwithoutalicens
6、e.(2)It+be+adj.+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-彳列：It，skindofyoutohelpmewiththeproblem・3.it作形式主语代替动名词的句型：It'snogood/usedoing…IVs(well)worthdoing...It9s(w
7、ell)worthwhiledoing...例：It"snousecryingoverspiltmilk.三it作形式主语的句型I.Ittakessb.sometimetodosth.某人用多长时间做某事Ittookthemenaweektomendourroof.2.It's(about/high)timethat…是该做某事的时候了It^sCabout/high)timethatweshouldtakeaction.3.It'sthex-thtime(that)…第儿次做某事了It'sthethirdtimethathehasfa
8、iledthedrivingtest.四it作形式宾语的常见句型1.verb+it+adj./noun(for/of)todo/clause(verb=think,believe,suppose,consider,fee
