高中英语名词性从句的知识点分析
在高中的学习中，学生会学习到很多的知识点，下面本站的小编将为大家带来关于名词性从句的知识点的介绍，希望能够帮助到大家。
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，名词性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。
引导名词性从句的连词可分为三类：
①that(不充当从句的任何成分，无词义。只起连接作用，因此往往可以省略。)
whether, if(不充当从句的任何成分，均表示“是否”表明从句内容的不确定性。不可以省略。)
as if,as though(均表示“好像”，“似乎”)
②what, whatever, who, whoever, whom, whose, which
③when, where, how, why
Who cleaned the blackboard is not known yet.谁擦的黑板还不知道。
What he said is not true.他说的不是实话
That he’ll come to see us is really great.他来看我们真是太好啦。
I don’t know why he is absent.我不知道为什么他不在。
The question is whether he will join us next time.问题是下次他是否跟我们一起干。
It looks as if it is going to rain. 看上去天要下雨了。
1.主语从句
①由从属连词引导的主语从句：
Whether the country should build a nuclear power station is something we must discuss.
那个国家是否应该建立核电站……
That light travels in straight line is known to all .光以直线传播
②由连接代词引导的主语从句：
What we need is more time. 我们所需要的是……
Whichever book you choose doesn’t matter to me.无论你选哪本书……
Whoever comes will be welcome.无论谁来……
③由连接副词引导的主语从句：
When the plane is to take off hasn’t been announced.飞机什么时候起飞……
Where he has been is still a puzzle.他到过哪儿……
How much water is flowing can be measured easily.水的流量是多少……
④关于形式主语 it
▲It + be +形容词+ that-从句
It is necessary that… 有必要……
It is important that…重要的是……
It is obvious that…很明显……
It is likely that….很可能
▲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……
(注意该句型的变式：It is known to all that the earth goes around the sun.=As is known to all,the earth goes around the sun.=What is known to all is that the earth goes around the sun.)
It has been decided that…已决定……
▲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……
可应用于此句型的名词还有fact / shame / honor / question/pity等。
▲It +不及物动词+ that-分句
It appears that…似乎……
It happens that…碰巧……
It occurred to me that…我突然想起……
It doesn’t matter whether he likes or not.
2.表语从句
可以接表语从句的连系动词有 be, look, remain, seem等等。
The problem is that millions of people die of illnesses caused by smoking.
……数百万人死于由抽烟引起的疾病
The question remains whether we can win the game…..我们是否能赢得这次比赛
That’s just what I want. ……我想要的
This is where our problem lies. ……我们的问题所在
The difficulty is how we can help smokers kick their habit……我们如何帮助吸烟的人……
注意：
①表语从句的表现形式除了用从属连词，连接代词和连接副词引导以外，还可以由as, as if，as though引导
Things were not as they seemed.
It looks as though it is going to rain.好象要下雨了。
②另外还要注意以下常用的两种结构：The reason why…is that … (而不用 because)
It ( This, That ) is because…
The reason why he was dismissed is that he didn’t work hard. 他为什么被开除是因为他工作不努力。
It is because the tobacco companies want to remain in business.
3.同位语从句
同位语从句一般由 that, whether 等连词引导，常放在 advice, doubt, fact, hope, idea, information, message, news, order, possibility, problem, question, reason, truth, word, suggestion.等名词的后面，说明该名词的具体内容。
The news that he had landed on the moon spread all over the world. 登陆月球…….
I have no idea when he will be back. ……什么时候回来
The thought came to him that Mary had probably fallen ill……Mary也许病了
He must answer the question whether he agrees to it or not.……是否同意
4.宾语从句
宾语从句可以作及物动词的宾语，介词的宾语，某些形容词的宾语以及非谓语动词的宾语。
①及物动词后的宾语从句：
She will give whoever needs help a warm support……任何需要帮助的人……
I wonder why she refused my invitation……她为什么拒绝了我的邀请
②介词后的宾语从句：
I always think of how I can improve my spoken English.我总是在思考如何提高我的口语水平。
The teacher is satisfied with what she has said. 老师对他所说的话很满意。
③某些形容词后的宾语从句：
I am sure that you will make greater progress in English through hard work.
……通过努力工作，你将取得更大的进步
We are surprised that he has left without saying goodbye to us…….他没有告别就走了
④非谓语动词后的宾语从句：
Realizing that it was just a difference in custom,the foreigner smiled and said nothing
On being asked whether he had had a good time in Australia, he answered “Terrible ”.
⑤关于形式宾语it
We must make it clear that anyone who breaks the law will be punished.
我们必须清楚任何违犯法律的人都将受到惩罚。
I find it necessary that we should ask him for his advice.我发现我们有必要征求他的意见。
5.名词性从句重难点
①在名词性从句中，疑问句要用陈述句的语序。例如：
▲Can you make sure ____the gold ring ?
e Alice had put e had Alice put
e Alice has put e has Alice put
▲You can't imagine __when they received these nice Christmas presents.
they were excited excited they were
excited were they were how excited
②动词 doubt 用在疑问句或否定句中，其后宾语从句常用 that 作连接词;用在肯定句中，连接词用 whether 或 if 皆可，而不用that。
Do you doubt that he will win ?
I don't doubt that your proposition is wrong .
He doubt whether I know it .
③ 否定转移问题。
▲将think, believe, suppose, expect, fancy, guess, imagine等动词后面跟宾语从句时否定转移
I don't think I know you. 我想我并不认识你。
I don' t believe he will come. 我相信他不回来。
We don't expect he will come tonight , will he ?
注意：若谓语动词为hope,宾语从句中的否定词不能转移。
I hope you weren't ill. 我想你没有生病吧。
▲将seem, appear 等后的从句的否定转移
It doesn't seem that they know where to go. 看来他们不知道往哪去。
It doesn't appear that we'll have a sunny day tomorrow. 看来我们明天不会碰上好天气。
④主谓一致问题。
What he wanted to see was an end to all the armies of the world.
What I bought were three English books.
⑤语气问题
▲在含有 suggest , order , demand , propose , command , request , insist, desire, require, advise 等表示要求、命令、建议、决定等意义的动词后，that从句常用“should+ 动词原形”的结构 I suggest we (should) set off at once. 我建议我们应该立刻出发。
▲在It is +过去分词+that的主语从句中 decided，demanded，desired，insisted，ordered，proposed，suggested，recommended，requested， required等。
It is desired that we(should)get everything ready this evening.
▲在表语从句或同位语从句中
The suggestion that the mayor (should) present the prizes was accepted by everyone.
▲在It is(was)+形容词+that从句中要用虚拟语气，即(should +)动词原形，表示建议或不满、惊奇等情绪。常用于此类的形容词有 essential，important，natural，necessary，possible，strange，等 It is necessary that a college student ____at least a foreign language.(上海1993)
ers ld master ered master
⑥What引导名词从句的特殊含义:
▲What was once regarded as impossible has now become a reality.
(what为“所……的事”，相当于“the thing that…;all that…;everything that…”)
▲After ________ seemed a very long time，I opened my eye and found myself in bed.(M ET'93) h
(what相当于“the time that”，表示“……时间”)
▲He is not what he was a few years ago. Who is it that has made Fred what he is now?
(what表示“……的人”，相当于“the person that…”)
▲What is now the North Sahara Desert was once a civilized world.
(what表示“……的地方”，相当于“the place that…”)
▲Our income is now double what it was ten years ago
(what表示“……的数目”，相当于“the amount /number that…”)
⑦不可省略的连词：
▲介词后的连词不可省略
Before I came downstairs I had prepared myself very carefully for what I must say.
下楼之前，我已经把我要说的认真准备好了。
▲引导主语从句和同位语从句的连词不可省略
That she was chosen made us very happy.她被选上了，我们很高兴。
We heard the news that our team had won. 我们听到消息说我们队赢了。
▲宾语从句有多个that引导时，从第二个及其后面的that不能省略
I believe(that)you have done your best and that things will get better.
⑧比较：whether 与 if 均为“是否”的意思。但在下列情况下，whether 不能被if 取代：
▲whether 引导主语从句在句首
Whether she comes or not doesn’t concern me .她是否来与我无关。
▲引导表语从句
His first question was whether she had arrived yet. 他问第一个问题就是她来了没有。
▲引导同位语从句
Answer my question whether you are coming.回答我你是否来的问题。
▲whether 从句作介词宾语
I worry about whether I hurt her feeling .我担心是否伤了她的感情。
▲与or not连在一起
I don’t know whether or not he is going to Japan.我不知道他是否去日本。
大部分连接词引导的主语从句都可以置于句末，用it 充当形式主语。例如：
It is not important who will go. 谁去，这不重要。
It is still unknown which team will win the match. 到底谁赢呢，形势尚不明朗。
点击下页查看更多高中英语的直接引语和间接引语的知识点 高中英语的直接引语和间接引语的知识点一. 直接引语和间接引语
(一)直接引述别人的原话，叫做直接引语;用自己话转述别人的话，叫做间接引语。间接引语一般构成宾语从句。直接引语必须放在引号内，间接引语则不用引号。直接引语改为间接引语时，除将引语部分变成宾语从句外，还必须对直接引语中的人称、时态、指示代词、时间状语、地点状语等进行改变。
1. 时态的变化：直接引语变为间接引语时，通常受转述动词said, asked等的影响而使用过去化的时态，即把原来的时态向过去推，也就是一般现在时变为一般过去时，现在进行时变为过去进行时，等等。例如：
Tom said to me,“My brother is doing his homework.”
→Tom said to me that his brother was doing his homework.
2. 人称代词、指示代词、时间状语、地点状语等等的变化： 根据意义进行相应的变化，例如：
She asked Jack,“Where have you been?”
→She asked Jack where he had been.
He said,“These books are mine.”
→He said that those books were his.
(二)直接引语改为间接引语时，都使用陈述语序，但是因为原句的句式不同，所以变成间接引语时所用的连词会有所不同。直接引语如果是一般疑问句，用连接词whether或if;如果是特殊疑问句，则用疑问词引导间接引语。转述的动词一般用asked，可以在其后加上一个间接宾语me, him, her, us等。如：
She said,“Is your father at home?”
→She asked me if/whether my father was at home.
“What do you do every Sunday?”My friend asked me.
→My friend asked me what I did every Sunday.
直接引语如果是祈使句，改为间接引语时，要将祈使句的动词原形变为带to的不定式，并在不定式的前面根据原句的语气(即请求或命令)加上ask, tell, order等动词，如果祈使句为否定式，则在不定式前加not。其句型为：ask / tell / order someone (not) to do something. 例如：
She said to us,“Please sit down.”
→She asked us to sit down.
He said to him,“Go away!”
→He ordered him to go away.
He said, “Don’t make so much noise, boys.”
→He told the boys not to make so much noise.
二. 各种时态的被动语态
被动语态概述
被动语态的概念：它是动词的一种形式，表示主语与谓语之间的执行或被执行关系。主动语态表示主语是谓语动作的执行者，例如：They saw the little boy crying by the river. 被动语态表示主语是谓语动作的承受者，例如：The little boy was seen crying by the river.
被动语态的构成
被动语态的形式是由“助动词be+动词的过去分词”构成。助动词be随着主语的人称、数、时态等的不同而变化。几种常见时态的被动语态形式如下：
1. 一般现在时 am/is/are + 过去分词
例如：Rice is planted in the south of China.
2. 一般过去时 was/were + 过去分词
例如：These trees were planted the year before last.
3. 一般将来时 will/shall + be + 过去分词
例如：A sports meeting will be held next week in our school.
4. 现在进行时 am/is/are + being + 过去分词
例如：Your radio is being repaired now.
5. 过去进行时 was/were + being + 过去分词
When he got there, the problem was being discussed.
6. 现在完成时 have/has + been + 过去分词
His work has been finished.
Has his work been finished? Yes, it has. / No, it hasn’t.
7. 过去完成时 had + been + 过去分词
注意：
1.除了be之外的其它系动词如get, stay等也可以和过去分词构成被动语态。例如：Their questions haven’t got answered.
2. 含有情态动词的谓语变成被动语态使用“情态动词+ be + 过去分词”结构。例如：
More attention should be paid to the old in this country.
This work can’t be done until Mr. Black comes.
3. 含有“be going to”, “be to”等结构的谓语，其被动语态分别用“be going to + be + 过去分词”和“be to + be + 过去分词”。例如：
The problem is going to be discussed at the next meeting.
All these books are to be taken to the library.
4. 被动语态与系表结构的区别：“连系动词+用作表语的过去分词”构成的系表结构，与被动语态的形式完全一样，所以应注意它们的区别。被动语态中的过去分词是动词，多强调动作;系表结构中的过去分词相当于形容词，多强调状态。前者通常可用by 引出动作的执行者，而后者则不可以。例如：
The map was changed by someone.(被动结构)
That custom remained unchanged for many centuries.(系表结构)
系表结构中的过去分词通常可被very修饰，被动语态中的过去分词往往要用much修饰。
例如：
He was very excited.(系表结构)
He was much excited by her words.(被动结构)
5. 主动形式表被动意义。有些动词的主动形式有被动意味，如 open, read, sell, shut, wash, wear, write等。此时句子的主语一般是物。例如：
These books sell well. 这些书很畅销。
The door won’t shut. 这门关不上。
The clothes wash well. 这些衣服很好洗。
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