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1、It形式主语it作形式主语，代替由不定式、动名词或从句表示的真正主语。It’simportantforustolearnasecondlanguage.It’snousetalkingtohim.It’sknowntoallthattheearthgoesroundthesun.高考热门考点（Itbe句型）Itisnouse/good+doingsthItisnogoodlearningEnglishwithoutspeakingEnglish.Itisuseless+doingsthItisuselesslearningEnglishwithoutspeakingEnglish.Itisawasteoftime+doingsthItisawasteoftimelearningEnglishwithoutspeakingEnglish.高考热门考点（Therebe句型）Thereisnodenyingthat+从句Thereisnodoubtthat+从句Thereisno/some/muchchancethat+同位语从句Thereisno/some/muchpossibilitythat+同位语从句2、It形式宾语（1）it作形式宾语，代替由不定式或从句表示的真正宾语。必考动词5个：find/feel/make/think/believeWefeelitourdutytohelpothers.Hemadeitclearthathewouldleavethecity.2、It形式宾语（2）it作形式宾语，代替由从句表示的真正宾语。必考动词7个：enjoy，prefer，love，like，hate，dislike，appreciate表示“喜欢、恨”等心理方面的动词后面接it，构成固定结构。I’dappreciateitifyouwouldliketoteachmehowtousethecomputer.如果你教我如何使用电脑我感激不尽。3、It强调句结构（1）Itis/was强调部分that/who非强调部分Hereadthreebooksinthelibraryyesterday.Itwashewho/thatreadthreebooksinthelibraryyesterday.(强调主语)Itwasthreebooksthathereadinthelibraryyesterday.(强调宾语)Itwasinthelibrarythathereadthreebooksyesterday.(强调地点状语)Itwasyesterdaythathereadthreebooksinthelibrary.(强调时间状语)3、It强调句结构（2）Itis/wasnotuntil…that…直到…才…Ididn'tgohomeuntilrainstopped.ItwasnotuntilrainstoppedthatIwenthome.Ididn‘tknowthenewsuntilyesterday.ItwasnotuntilyesterdaythatIknewthenews.3、It强调句结构(3)特别注意强调句的第三种结构译为“究竟，到底”疑问词+is/wasitthat+陈述句型？（1种）疑问词+itis/wasthat+陈述句型.（2种）Whoisitthatspokefirst?特殊疑问句Iwantedtoknowwhenitwasthattheycamehere.名词性从句Didyouwanttoknowwhenitwasthattheycamehere?名词性从句4、It在虚拟语气定语从句中的运用在Itis(high/about)time(that)+定语从句中，谓语用过去时或用should+动词原形。Itistimethatchildrenshouldgotobed.should不可省略Itistimethatchildrenwenttobed.5、It在时态中的运用Itisthefirst(second...)timethat..现在完成时ItisthefirsttimeIhavebeenhere.Itwasthefirst(second..)timethat.过去完成时ItisthefirsttimeIhadbeenhere.