引导词it的用法

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1、引导词it的用法1.作形式主语  为了避免头重脚轻，英语里面常常把it放在句子的开头，而把真正作为主语的动名词，不定式和句子放在句子的后面去。请看下面的例子：It’swrongtotellatie.Ittookmetenminutestogettothestation.It’snousegettingtheresoearly.It’sdangerousplayingwithfire.Itdoesn’tmatterwhetherhewillcomeornot.It’sapityIdidn’tthinkofitearlier.It’snotyetknownwherehehasgon

2、e.2.作形式宾语,当复合句中，不定式短语，动名词短语和名词性从句作宾语时，常常it用作形式宾语，而把真正的宾语放在宾语补足语之后。请看例句：Hefeelithisdutytohelpothers.Thenewmedicinemadeitpossibletotreatthisterribledisease.Wethoughtitnousedoingthat.Outteacherthinksitnogoodlearningwithoutpractice.Ithinkitimportantthatweshouldtakepartinthediscussion.Hesoonmadei

3、tclearwhyshehadn’tinvitedmetotheparty.Wouldn’titbetterifyoumadeanappointmenttoseehimattheoffice?（三）it用于强调句型,结构：It+动词be+被强调部分+who(whom)/that+其他部分这个结构的一般疑问句形式为：被强调部分+who(whom)/that+其他部分若是对特殊疑问词进行强调，其结构为:特殊疑问词+be+it+that+其他部分WasitinLondonthatthishappened?WhenwasitthatheleftBeijingforShanghai?Ho

4、wwasitthatyoucamehere?Heaskedmethatwhereitisthatwewillhavethemeeting.Not----until----句型的强调结构为itisnotuntil-----that-------,that后面要用肯定形式Eg.Myfatherdidn’treturnuntil11o’clocklastnight.Itwasnotuntil11o’clocklastnightthatmyfatherreturned.Ididn’trealizeshewasafamousfilmstaruntilshetookoffherdarkgl

5、asses.(四)it的重要句型1.Itisclear(obvious，true，possible，certain....)that.....该句型中it是形式主语，真正的主语是that引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）2.Itisimportant(necessary，right，strange，natural...)that...该句型和上一个同属一个句型；由于主句中的形容词不同，that后的从句中要用虚拟语气（should+动词原形），should可以省去，建议记住该句型中的形容词。eg.Itisimportantthatwe(should)learn

6、Englishwell.　　Itisnecessarythathe(should)rememberthesewords.3.Itissaid(reported,learned,thought,believed,hoped,suggested,supposed,known....)that...该句型中的it仍是形式主语，真正主语是that引导的主语从句；该结构常译为＂据说（据报道，据悉．．．）　　ItissaidthathehascometoBeijing.　　Itisreportedthatanotherearthsatellitehasbeenputintoorbit.4.

7、Itissuggested(ordered/demanded/insisted/commanded...)that...该句型和上一个同属一个句型，主句中的过去分词是表示请求，建议，命令等词时，that　后的从句要用虚拟语气（should+动词原形），should可以省；常译为＂据建议；有命令．．．）　　Itissuggestedthatthemeeting(should)beputoff.　Itwasorderedthatwe(should)arrivethereintwohours.5.