2026届高考英语一轮复习名词性从句基础知识清单

名词性从句一、概念在英语的句子结构中，本来该由名词充当的主语、宾语、表语和同位语，由一个句子来充当，这个句子就叫名词性从句。二、引导词从属连词：that,if,whether连接代词：what,whatever,which,whichever,who,whoever,whom,whomever,whose连接副词：when,where,how,why三、主语从句位置：位于动词（谓语动词/系动词）之前；It作形式主语（1）It+be+形容词（necessary/likely/difficult/important/certain···）+that从句eg:ItisimportantthatweshouldstudyEnglishwell.（2）It+be+名词（短语）（apity/nowonder/nosurprise等）+that从句eg:Itisapitythatyoucan’tcome.（3）It+be+过去分词(said/reported/thought/believed/decided等)+that从句eg：Itissaidthatwewillhavealongholiday.（4）It+不及物动词（seems/appears/happens等）+that从句eg:Itappearsthatwewon’tbelaidoff.看起来我们不会被解雇。四、宾语从句位置：位于谓语动词，介词和部分形容词之后；It作形式宾语：一些动词后的宾语从句有宾语补足语时，需要用it作形式主语；常这样用的动词有feel/find/think/consider/believe/guess/suppose/make等；eg:IfindithardthatwecanstudyEnglishwell.动词hate/like/dislike/appreciate/enjoy等以及及物动词短语seeto(确保),dependon,relyon等后常用it作形式宾语；eg:Ishallseetoitthatheistakengoodcareofwhenyouareabsent.五、表语从句1、位置：位于系动词之后系动词:be(1)seem,appearto(2似乎)keep,remain,stay(3保持)Become,turn,get,grow(4变得)look,taste,smell,sound,feel,(5感官)2、asif/asthough（似乎，好像）引导的表语从句，常放在be,seem,look,taste,sound等之后；eg:Itsoundsasifyouhaveagoodtime.because和why引导的表语从句This/Thatis/wasbecause···这是/那是因为···This/Thatis/waswhy···这是/那是···的原因eg:Hehaslungcancer.Thatisbecausehehasbeensmokingtoomuch.六、同位语从句1、位置：位于抽象名词之后：2、抽象名词：news,fact,idea,opinion,doubt,hope,wish,order,advice,suggestion,thought,decision,conclusion,question,problem,word,possibility,truth,promise等3、that引导定语从句和同位语从句的区别:that在定语从句中指人或物，作主语或宾语，作宾语时可以省略；在同位语从句中，that不作成分，没有实意，不能省略；eg:ThenewsthathetoldmewasTomwasill.(定语从句)（对news进行限定修饰）ThenewsthatTomwasillwastoldbyhim.(同位语从句)（对news消息的内容进行解释）注意名词性从句的语序：陈述语序Whether和if引导名词性从句的区别：（只用whether的情况）引导主语/表语/同位语从句；作介词宾语：后接动词不定式；后有ornot时；作discuss/decide/advise/choose/consider的宾语;what和which在名词性从句中作定语的区别：Which+n.在一定范围内的“哪个···”What+n.无范围，泛指，“什么样的···”Idon’tknowwhatcolorhelikesbest.Idon’tknowwhichcolorhewillchoosefromtheseclothes.做题步骤根据位置判断是什么从句；分词从句缺少什么成分，缺啥补啥缺主语，宾语，表语，定语，用连接代词（根据句意选择）；