英语名词性从句讲解

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1、主语从句作句子主语的从句叫主语从句避免句子头重脚轻，常用句型如下：Whetherhewillcomeornotisnotknown.他来不来还不清楚(1)It+be+名词+that从句ItisstillamysterywhatcausedtheaccidentWhathewantstotellusisnotclear.他要跟我们说什么，还不清楚(2)It+be+形容词+that从句Itiscertainthathewillwinthematch.Itistruethathehasmadeaveryimportantdiscoveryinchemistry.Whowillwinthemat

2、chisstillunknown.谁能赢得这场比赛还不得而知。ItisstrangethatheshoulddothatItisverylikelythattheywillholdameeting.Itisknowntoushowhebecameawriter我们都知道他是如何成为一名作家的。Itisimportantthatweallshouldattendthemeeting-Itisstrangethatthemanshouldhavestucktohissillyideas.WheretheEnglisheveningwillbeheldhasnotyetbeenannounce

3、d.英语晚会将在哪里举行，还没有宣布。It+be+动词的过去分词+that从句ItissaidthathehasgonetoshanghaLThatheislateforschoolmakestheteacherveryangry.他上学迟到让老师很生气ItisknowntoallthatthegunpowderwasfirstinventedbytheChinese.Itissuggestedthatthework(should)bedonewithgreatcare.注意：在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“Ghould)+do，，，常用的

4、句型有：Itisnecessary(important,natural,strange,etc.)that+(should)+doItissuggested(requested,proposed,desired,etc.)that+(should)+do主语从句的时态：不受主句的时态影响和限制。(1)Whetherwewillgoforanoutingtomorrowremainsunknown.(2)Whowillbeourmonitorhasn'tbeendecidedyet.(3)Whomvvemuststudyforisaquestionofgreatimportance*(4)

5、Whatcausedtheaccidentremainsunknown.(5)Whateveryoudidisright(6)Whothewatchbelongstowaslostisunknown.四.宾语从句1.定义：名词句用作宾语的从句叫宾语从句。2.由连接词that引导宾语从句时，that在句屮不担任任何成分，在口语或非正式的文体中常被省去，但如从句是并列句时，第二个分句前的that不可省。例如：HehastoldmethathewillgotoShanghaitomorrow.他已经告诉我他明天要去上海。Wemustneverthink(that)wearegoodinever

6、ythingwhileothersaregoodinnothing.我们决不能认为口己什么都好，别人什么都不好。Weallthink(that)sheisworkinghardandthatshewillsurelygotoaverygooduniversity.我们都认为她学习非常努力，一定能进一个非常好的大学。3・在demand、order>suggest>decide>insist,desire,request，command等表示要求、命令、建议、决定等意义的动词后，宾语从句常用“(should)+动词原形叫例如:Iinsistthatshe(should)doherworkal

7、one.我坚持耍她Cl己工作。Thecommanderorderedthattroops(should)setoffatonce.司令员命令部队马上出发。4.可运用形式宾语it代替的宾语从句①动词find,feel,consider,make,believe等后面有宾语补足语的时候，则需要用it做形式宾语而将that宾语从句后置.Ithinkitnecessarythatwetakeplentyofhotwatereveryday.