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名词性从句讲解（2 ）应城市第三高级中学刘琪一．表语从句：在复合句中，位于系动词之后作表语的从句叫表语从句。
引导表语从句的关联词与引导主语从句的关联词大致一样，表语从句位于系动词后，有时用as if引导。
1.that 引导表语从句，无词义，只起连接作用，不可省。
2.联系动词可为be,look,seem,sound,appear等。
3.主语可为名词fact,truth,cause,question,explanation,trouble,assumption,belief等，代词this,that,these,it等。
4.whether 引导表语从句The fact is that we have lost the game.That’s just what I want.This is where our problem lies.That is why he didn’t come to the meeting.It looks as if it is going to rain.China is not what it used to be.The question is whether the enemy is marching towards us。
【注意】1.当主语是reason时，表语从句要用that引导而不是because。
The reason why he was late was that he missed the train by one minute this morning.2.whether可引导表语从句，但与之同义的if却通常不用于引导表语从句。
3.That is why…译为“这就是……的原因”。
其中why引导的名词性从句在句中做表语，该句型通常用于针对前面已经说过的原因进行总结。
That is why you see this woman before you know.That is why I came.区别：①That is why ……与That is the reason why …同义，只不过从语法结构上讲，前者中的why引导表语从句，后者中的why引导定语从句。
高中英语真题:名词性从句一、主语从句1．It＋系动词＋形容词(necessary，right，likely，unlikely，wrong，important，certain，clear，obvious，strange，normal等)＋that从句It is certain that most of the farmers have brought in more mo ney by all means.2．It＋be＋名词(短语)(a pity，a shame，good news，a fact，an honour，a wonder，no wonder等)＋that从句It’s no wonder that you’ve achieved so much success.3．It＋be＋过去分词(said，told，heard，reported，decided，suggested，advised，ordered，remembered，thought，considered，wellknown，announced等)＋that从句It is said that the professor has already succeeded in carrying out the experiment.4．It＋特殊动词(seem，appear，happen，matter)＋that从句It happened to me that I had been away when he called.二、宾语从句1．动词的宾语从句有些动词带宾语从句时习惯上需要在宾语从句前加it。
这类动词(词组)有hate，enjoy，like，love，dislike，see to等。
I hate it when they talk with their mouths full.2．一般情况下介词后只能用wh类连接词引导宾语从句。
We are talking about whether we admit students into our club.注意：(1)where引导的从句有时也可用作介词的宾语。
名词性从句在句子中起名词作用的句子叫名词性从句(Noun Clauses）。
名词性从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。
第一节知识点讲解顾名思义，主语从句在句子中作主语。
有时本身出现在主语的位置上，也有时出于句子结构的考虑退到句子的尾部，前面用形式主语it代替。
从句作主语时，谓语动词一般为单数形式。
如:What I saw was beyond any verbal description.That his hair was turning grey worried him a bit.Why the company denied the contract is still unknown.When and where the government will build a city square is under discussion.It is pretty annoying that a small part of the machine is missing.It remains to be seen whether the new novel will be well received.Tips: 主语从句的that绝对不能省去。
因为句子是不能做主语的，故用that引导。
若去掉则没有了主语，而宾语从句的that可省。
主语从句：That he is right is known to all of us.宾语从句：We all know (that) he is right.1. It 作形式主语和it引导强调句的比较It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。
而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。
It is important that…重要的是……It is obvious that…很明显……b. It + be + -ed 分词+ that-从句It is believed that…人们相信……It is known to all that…众所周知……It has been decided that…已决定……c. It + be +名词+ that-从句It is common knowledge that………是常识It is a surprise that…令人惊奇的是……It is a fact that…事实是……d. It +不及物动词+ that-从句It appears that…似乎……It happens that…碰巧……It occurred to me that…我突然想起……七、名词性wh-从句1）由wh-词引导的名词从句叫做名词性wh-从句。
Wh-词包括who, whom,. whose, whoever, what, whatever, which, whichever等连接代词和where, when, how, why等连接副词。
Wh-从句的语法功能除了和that-从句一样外，还可充当介词宾语、宾语补语和间接宾语等，例如：主语：How the book will sell depends on its author. 书销售如何取决于作者本人。
直接宾语：In one's own home one can do what one likes. 在自己家里能够随心所欲。
间接宾语：The club will give whoever wins a prize.俱乐部将给得胜者设奖。
表语：My question is who will take over president of the Foundation. 我的问题是谁将接任该基金会主席职位。
新概念英语（二）名词性从句【三篇】导读：本文新概念英语（二）名词性从句【三篇】，仅供参考，如果觉得很不错，欢迎点评和分享。
（一）表语从句：在复合句中充当表语。
1. that在引导表语从句时无含义，不作成分，通常不省。
1)表示事实、真理等的实际内容。
The fact is that he is lying.Theoddsare that he will not do it.2）表示某人的意见、信念等的实际内容。
Ourbeliefis that things will improve.The trouble is that we are short of money.2. whether引导表语从句（不可用if)。
His first question was whether Holmes had arrived yet.The question is whether people will buy it.3. 连接代词who, whom, whose, what, which引导的表语从句。
This is what I want.The question is who can be chosen to bemanagerof the company.My question is which of them is better.4. 连接副词when, where, why, how引导的表语从句。
The problem seemed how we could make him understand it. The question is where we should go.5. as if, as though引导的表语从句（常用虚拟语气）。
He looks as if he were angry.It looks as if it's going to rain.（二）宾语从句：在复合句中充当宾语。
名词性从句1主系表句型----- be （连系动词do）2、主谓宾----- do（vt）3、主谓----- do(vi)----(不及物动词)4、主谓宾补----do(vt)5、主谓宾宾---do(vt) 记双宾语的动词一定要记。
6、There be (不及物动词do)--------be (不及物动词)宾语从句定义：在主谓宾句型的宾语的位置上把做为名词的宾语扩展成一个be句型或者do句型。
可以用下列公式进行表示：主语+谓语+从句。
宾语从句的连词①that ,②whether(or not)或if;③which(whichever), who(whoever)，whom(whomever) ，whose(whosever)，what(whatever);④when(whenever)，where(wherever)，why，how(however); ⑤how many, how much, how long, how often，how soon宾语从句的形式：1、主谓宾句型的宾语从句:做为名词的宾语扩展成一个be句型或者do句型。
He knows the newsHe knows that the teacher is in classroom2, 主谓宾宾---do(vt) 句型的宾语从句，把直接宾语变为一个be或do句型。
He tells me the newsHe tells the news to meHe tells me that she is a teacherHe tells that she is a teacher to me3、主谓宾补句型的宾语从句需要it来做形式宾语I find Chinese important主谓宾补I find that we make a quick decision about this matter important主谓宾语从句补I find it important that we make a quick decision about this matter主谓形式宾语补宾语从句I think it necessary that we take plenty of hot water every day .我认为每天多喝开水是有必要的.I feel it a pity that I haven’t been to the get-together.我没去聚会,感觉非常遗憾.I have made it a rule that I keep diaries.我每天写日记成了习惯.4、宾语从句的省略形式：某些形容词后面可以带宾语从句，其形式为sb+be+形容词+that宾语从句：这一类形容词通常是表示人物的心理，情感等状态的形容词如：sure,certain,glad,please,happy,sorry,afraid,satisfied,surpriseda. I am glad (that) you helped me.b、I am sure (that) you can pass the exam.表语从句同样的道理，如果在主系表句型表语的位置上把表语变成一个be句型或者do句型，则称为表语从句。
