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1、高中英语语法加练习大全：第18章名词性从句一.概念名词性从句共有四种:主语从句,表语从句,宾语从句和同位语从句二.相关知识点精讲1．主语从句：主语从句在整个句子中作主语。(1)不同于其它的连词，它不充当句子的成分，只是单纯的连接词，通常不可以省略。分句置于句首时，that绝对不可以省略。Thatthedrivercouldnotcontrolhiswarwasobvious.Itwasobviousthatthedrivercouldnotcontrolhiscar.(2)if不能用在主语从句中，
2、而是用whetherWhetherheleft(ornot)isunknown(3)当主语从句作主语时，谓语动词一般用第三人称单数，下面这个句型例外。Whatweneedismoretimeandmoney.Whatweneedaremanymorebooks.2.表语从句：表语从句出现在系动词后，充当表语。Thetroubleisthatweareshortofmoney.Goandgetyourcoat.It’swhereyouleftit.(1)引导表语从句除了上述三类词外还有because
3、,asif/asthough等等Thereason(why/forwhich…..)isthat……It/This/Thatisbecause……(2)连系动词“appear,look,seem”的两个常用句型Itseems/appearsthat….Itlooks/seemsasif/asthough……(与事实相符用陈述语气，与事实相反用虚拟语气)(3)as也可以引导表语从句Thingsarenotalwaysastheyseemtobe3.宾语从句：及物动词，形容词和介词后加宾语从句作其宾语
4、。(1)宾语从句时态与主句相呼应，但宾语从句表示的是客观真理或普遍现象除外Theteachertoldusthattheearthmovesaroundthesun(2)连词whether和if可以互换，但注意下列情况连词后紧跟ornot时用whetherIwanttoknowwhetherornottheywillcome.作介词宾语是用whether引导宾语从句Hewasinterestedinwhetherhesawherthere.连接词后直接加不定式，不能用if只能用whetherHed
5、oesn’tknowwhethertostayornot.如果宾语从句是否定时，一般用if引导Icareifhewillnotattendthemeeting.(3)当宾语从句后带宾补时，要用“主语+谓语+it+宾补+that-clause,that不可省略Ithinkitcertainthatshewilldowellinherexam.(4)当主语是I,we，主句用think,believe,suppose,expect,imagine五个动词时，用否定转移Idon’tthinkhewillw
6、inthegame,willhe?(5)that在宾语从句常可以省略，但由and或but连接两个或多个宾语从句时，仅可以省略第一个连词thatHesaid(that)hehadeatennothingbutthathewasn’thungry.(6)注意区别if引导的宾语从句和条件状语从句Idon’tknowifhewillcome.Ifhecomes,I’llletyouknow.4.同位语从句，在句中作某些名词的同位语，对前面的名词进一步说明。用在下列名词fact,news,idea,hope
7、,believe,hope,thought,doubt.truth,order,suggestion,wordetc.(1)Thereisnodoubtthathewillcome.Thereisdoubtwhetherhewillcome.WordcamethatNapoleonwouldcometoinspectthem.Thereisnopossibilitythat….(2)that引导的同位语从句与定语从句的区别：在同位语从句中：that不可以省略，不作成分;定语从句的关系代词that在
8、定语从句作成分，作宾语时可以省略Weareinterestedinthenewsthatsomeforeignerswouldvisitourschool.Weareinterestedinthenewsthathetoldus.when,where引导的同位语从句与定语从句的区别：在定语从句中，when,where前有分别表示时间、地点的先行词；而在同位语从句中无此对应关系Theyhavenoideaatallwherehehasgone.(同位语从句)Goandgetyourc
