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1、 名词性从句一直备受高考命题者的关注，近几年来的高考题主要考查在具体语境中连接词的选择，尤其是连接词what和that的辨析，以及whether 与if表示“是否”时的区别。因此，正确区分名词性从句的类型，根据在从句中的作用和所表达的意义，确定恰当的连接词是一轮复习的重点。此外，名词性从句和定语从句的辨析，也是高考考查的重点。 一、认识各种名词性从句名词性从句相当于名词，可分别作句子的主语、表语、宾语和同位语。因此，名词性从句具体分为主语从句、表语从句、宾语从句和同位语从句。名词性从句中的连接词有连词that / whether / if，连接代词what / who(m)/ which /
2、whose / whatever / whoever / whomever / whichever，连接副词where / when / why / how 。从名词性从句在句中所起的作用来说，名词性从句是句子不可缺少的一部分，和句子的其他成分之间也不会用逗号隔开。而定语从句和状语从句是句子中的修饰成分，去掉之后不会影响句子主体结构的完整性。这是判断是否是名词性从句最主要的特征。如：I wonder how much these shoes cost. (宾语从句，不可省去)He is the very man I look after. (定语从句，修饰the man)You may bor
3、row the book as long as you keep it clean. (状语从句)1主语从句Who will go is not important. It doesnt matter so much whether you will come or not. (形式主语it代替后面的真正的主语从句)注意：that引导主语从句放于句首时，不能省略。That he suddenly fell ill last week made us surprised. 2表语从句The question was who could go there. My idea is that we c
4、an get more people to help in the work. That is why the brothers wanted to make a bet. It looked as if it was going to rain. 3 .宾语从句I hope (that) everything is all right. 注意：(1)that在引导宾语从句时，常可省略，但如果有两个以上的宾语从句时，最后一个从句的that不能省略。如：I know (that) he has just graduated from college and that he is looking
5、for a job. (2)如果动词宾语后又有补语，那么要使用it作形式宾语，然后把宾语从句放在补语之后。如：I make it known that well be invited to the ball. (3)如果主句的谓语动词的时态是一般过去时，那么从句的时态要采用相应的与过去有关的时态，但如果从句描述的是客观事实，从句时态不可调整“呼应”。如：She remembered that she had left her wallet at the school gate. Our teacher said that light travels faster than sound. 4同位
6、语从句同位语从句在句中作某一名词的同位语，一般位于该名词(如：news, fact, idea, suggestion, promise等)之后，说明该名词的具体内容。如：I have no idea when he will be back.The fact that he had not said anything surprised everybody. 注意：在动词：一坚持(insist)、二命令(order，command)、三建议(suggest，advise，recommend)、四要求(demand，require，request，ask)后的宾语从句和这些动词的过去分词后的主
7、语从句，以及这些动词的名词引出的表语从句和同位语从句中，谓语部分常用(should)do形式。如：He insisted that he (should) try once again. His advice is that everyone (should) do his best to help the poor girl. It is required that students (should) attend at least 90% of the lectures. 二、名词性从句的连接词名词性从句的连接词是名词性从句中最核心的问题，也是高考的常考点。连接词的选择要考虑它在从句中的作
8、用和所表达的意义。连接词词义在句中所例句作成分从属连词that/The problem is that we dont haveenough money.if/ whether是否/ The question is whether they have so much money.连接词词义在句中所例句作成分连接代词who/whom/which/whose/what原疑问代词的意义；what更常表示：the thing that / the that 所的东西/主语、宾语、表语、定语Pay attention to what the teacher said. Who kept the door
9、 open all night was unknown.whoever/whomever/ whichever/ whatever 无论谁/ 无论哪个(些)/无论什么主语、宾语、表语、定语Whoever breaks the law will be punished. You can take whichever book you like. 连接词词义在句中所作成分例句连接副词when/ where/ why/ how 原疑问副词的意义或“的时间(the time when)；的地点(the place where)；的原因(the reason why)”；的方式(the way that
10、)状语When he will go is unknown. I wonder why he tried to avoid me. This room is where I was born. This is how we work. 1what与that(1)【误】 All what he did was for you. 【正】 What he did was for you. 【正】 All that he did was for you. (2)【误】 I was thinking that I could do for you. 【正】 I was thinking what I c
11、ould do for you. 【解析】 what引导名词性从句，what相当于the thing that/ the that/ all that等，具体的意义要根据上下文确定。在名词性从句中，what既有意义，又在从句中作一定的成分，而that无意义，且在从句中不作成分。2who与 whoever【误】 Who is the first to come will get a gift. 【正】 Whoever is the first to come will get a gift. 【正】 Anyone who is the first to come will get a gift.
12、 【解析】 whoever引导名词性从句，意为“无论谁”，相当于anyone who；而who意为“谁”。3whether与if(1)【误】 They dont know if to go there. 【正】 They dont know whether to go there. (2)【误】 It depends on if we have enough time. 【正】 It depends on whether we have enough time. 【解析】 在以下情况只能用whether不能用if：作介词宾语时，连接词一般用whether。It all depends on w
13、hether they will come back. 后面直接跟or not 时，用whether。I didnt know whether or not he had arrived in Wuhan. 主语从句、表语从句和同位语从句中，只能用whether。Whether the meeting will be put off has not been decided yet. The question is whether they have so much time. whether可与动词不定式连用，但if不能。I have not decided whether to go or
14、 not. whether可引导一个让步状语从句，表示“不管，无论”，而if不能。Whether he comes or not, we will begin our party on time. 4whoever 与whomever【误】 Please give the book to whomever needs it most. 【正】 Please give the book to whoever needs it most. 【解析】 此处，whoever在从句中作主语，因此不能用whomever。名词性从句引导词的选择要注意其意义及它在从句中所作的成分。5【误】 He will w
15、in the match is certain. 【正】 That he will win the match is certain. 【正】 It is certain that he will win the match. 【解析】 that位于句首引导主语从句时，不能省略。6【误】 What we bought was some bananas. 【正】 What we bought were some bananas. 【解析】 what 引导的从句作主语时，若表示复数概念，谓语动词则用复数。7名词性从句的语序【误】 So now you know what should you do.【正】 So now you know what you shou
