名词性从句语法
语法解析名词性从句
语法解析名词性从句一、概念说明名词性从句是从句的一种，它在句中的地位和作用相当于名词。
名词性从句可以充当主语、宾语、表语或同位语。
二、主语从句主语从句用来充当整个句子的主语。
示例：1. What she said is true.（主语从句作主语）2. Whether he will come is uncertain.（主语从句作主语）3. If it rains, we will stay at home.（主语从句作主语）三、宾语从句宾语从句用来充当及物动词或介词后面的宾语。
示例：1. She asked me what my name was.（宾语从句作宾语）2. I wonder if he is coming.（宾语从句作宾语）3. He told me where he lived.（宾语从句作宾语）四、表语从句表语从句用来充当系动词后面的表语。
示例：1. The important thing is that we keep trying.（表语从句作表语）2. His wish is that everyone be happy.（表语从句作表语）3. Her dream is to become a famous singer.（表语从句作表语）五、同位语从句同位语从句用来解释或说明名词的具体内容。
示例：1. The fact that he didn't study resulted in a poor grade.（同位语从句解释the fact）2. My understanding is that we need to work together.（同位语从句解释my understanding）3. The idea that she suggested is worth considering.（同位语从句解释the idea）六、关系代词引导的名词性从句关系代词引导的名词性从句在从句中充当成分的同时，引导词也在主句中充当成分。
英语语法：名 词 性 从 句
英语语法：名词性从句名词性从句是在句子中起名词作用的句子。
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。
我在这里整理了相关学问，快来学习学习吧!英语语法：名词性从句主语从句宾语从句表语从句同位语从句作及物动词宾语作介词宾语that一般不省略可以省略一般不省略一般不省略一般不省略Whether/if〔是否〕放于句首时只用whether用whether/if均可，但有区分只用whether只用whether只用whether 特殊疑问词留意语序要用陈述语序名词性关系从句留意语序要用陈述语序一、that 从句1、主语从句(1)that从句作主语时，常用it作形式主语，常见的句型有：It+be+形容词(obvious, true, natural,surprising,good,wonderful,funny,possible,likely,certain,probable,etc.)+that从句It+be+名词词组(no wonder, an honor, a good thing, a pity, no surprise, etc.)+that从句It+be+过去分词(said, reported, thought, expected, decided, announced, arranged, etc.)+that从句(2)that可以省略，但that从句位于句首时，that不能省略。
2、宾语从句(1)常见的可以接that从句作宾语的动词有see, say, know, imagine, discover, believe, tell, show, think, consider, be sure, be afraid等。
在可以接复合宾语的动词之后，如think, make, consider等，可以用it作形式宾语。
名词性从句语法
名词性从句语法英语语法--名词性从句讲解(一)在句子中起名词作用的句子叫名词从句(Noun Clauses）。
名词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。
一、引导名词性从句的连接1. 连接代词：who， whose， whom， what， which.有词义，在从句中担任成分。
2. 连接副词：when， where， why， how.有词义，在从句中担任成分，作状语。
3. 连接词：that， whether， if， as if在从句中不担任成分，有时可省略；二. 具体分类1、主语从句作句子主语的从句叫主语从句。
What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。
It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。
Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行，还没有宣布。
有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。
主语从句后的谓语动词一般用单数形式。
常用句型如下：（1）It + be + 名词 + that从句（2）It + be + 形容词 + that从句（3）It + be + 动词的过去分词 + that从句（4）It + 不及物动词 + that 从句另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：It is necessary (important, natural, strange, etc.) that …It is a pity (a shame, no wonder, etc.) that…It is suggested (requested, proposed, desired, etc.) that…2、宾语从句名词句用作宾语的从句叫宾语从句。
高中英语语法名词性从句
1.______ the baby could speak made his parents very happy. 主语从句 A. That B. What C. Why D. If 2. I wonder ____ you will go shopping or stay at home. A. that B. if C. whether D. what 宾语从句 3. This is _____ he was often late for school. A. what B. that C. why D. whether 表语从句 4. We all know the truth ____ the earth ____ around the sun. 同位语从句
主语
例:不太清楚她为什么迟到。 Why she was late is unclear.
主语
例:这本书怎么销售取决于它的作者。
How the book will be sold depends on its writer .
1 That he will succeed is certain .
2 Whether he will go there is not known . 3 What he said is not true . 4 Where he hid the money is to be found out . 5 Whoever comes is welcome. 6 How we can help the twins will be discussed at the meeting. 7 When they’ll start the project has not been decided yet.
【英语知识点】名词性从句语法总结归纳
【英语知识点】名词性从句语法总结归纳名词性从句是在句子中起名词作用的句子。
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。
接下来分享名词性从句的语法，供参考。
1.主语从句通常由下列词引导：①从属连词that、whether等。
②连接代词what、who、which、whatever、whoever、whom、whichever等。
③连接副词how、when、where、why等。
that在句中无词义，只起连接作用;连接代词和连接副词都在句中既保留自己的疑问含义、又起连接作用，连接代词主要作主语，宾语，表语，定语等，连接副词在从句中作状语。
注：whom、who指人，what指物，whatever、whoever表示泛指意义。
2.有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。
主语从句后的谓语动词一般用单数形式。
常用句型如下：(1)It be+名词+that从句：It's a great pity that they didn't getmarried.他们没能结婚，真是令人惋惜。
(2)It be+形容词+that从句：It's splendid that you passed yourexam.你通过考试了，真棒。
(3)It be+动词的过去分词+主语从句：It's said that he has been there many times.据说他去过那儿很多次。
(4)It+不及物动词+that 从句：It is suggested (requested, proposed, desired, etc.) that…。
1.宾语从句，是名词性从句的一种。
在主从复合句中充当宾语，位于及物动词、介词或复合谓语之后的从句称为宾语从句。
宾语从句分为三类：动词的宾语从句，介词的宾语从句和形容词的宾语从句。
2.宾语从句的引导词有三种：(1)以that引导的宾语从句：that引导的宾语从句一般都是由陈述句充当，引导词that没有实际意义，不在从句中作任何成分，that可以省略，而且从句成分齐全，句意完整。
名词性从句语法总结
名词性从句语法总结名词性从句是在句子中充当名词成分的从句，它可以在句子中作主语、宾语、表语、定语等成分。
名词性从句包括主语从句、宾语从句、表语从句和定语从句。
在使用名词性从句时，需要注意从句的引导词和从句本身的语法结构。
下面对名词性从句的语法规则进行总结：1. 主语从句。
主语从句在句子中充当主语成分，常常由连接词 that, whether, if, who, whom, whose, what, which, when, where, why, how 等引导。
例如：What he said is true.（他说的是真的。
）。
Whether we can go camping depends on the weather.（我们能否去野营取决于天气。
）。
2. 宾语从句。
宾语从句在句子中充当宾语成分，常常由连接词 that, whether, if, who, whom, whose, what, which, when, where, why, how 等引导。
例如：I know who did it.（我知道是谁干的。
）。
She asked me where I was going.（她问我要去哪里。
）。
3. 表语从句。
表语从句在句子中充当表语成分，常常由连接词 that, whether, who, whom, whose, what, which 等引导。
例如：The problem is that we don't have enough time.（问题在于我们没有足够的时间。
）。
Her wish is that she can travel around the world.（她的愿望是能够环游世界。
）。
4. 定语从句。
定语从句在句子中充当定语成分，用来修饰某个名词或代词。
常常由连接词that, who, whom, whose, which, when, where 等引导。
高中英语语法---名词性从句详解
名词性从句详解名词性从句包括主语从句、表语从句、宾语从句、同位语从句。
其关联词有连接词that，if，whether；疑问代词who，what，which和疑问副词when，where，how，why等。
一.语法讲解1.主语从句主语从句在句中做主语。
它可以放在主句谓语动词之前，但多数情况由it作形式主语，而把主语从句放在主句之后。
例如：Who did that is known to all.It is interesting that you should like him.2.表语从句表语从句在句中作表语，位于主句中的系动词之后。
如：The question is who can complete the difficult task.表语从句不能用if引导，但可用as if引导。
例如：He looked as if he was going to cry．3.同位语从句同位语从句跟在名词后面，进一步说明该名词的具体内容。
引导同位语从句的名词主要有fact，news，promise，idea，truth等。
连接词用that（不用which），及连接副词how，when，where，why等。
例如：His delay is due to the fact that the car went wrong halfway．The news that our team has won the match is true.She asked the reason why there was a delay．4.宾语从句1.宾语从句在句中作及物动词或介词的宾语。
例如：We can learn what we did not know．He will talk to us about what he saw in the U.S.如果主句的谓语动词是及物动词make，find，see，hear等，则把宾语从句置于宾语补足语之后，用it作为形式宾语。
名词性从句的语法解析
名词性从句的语法解析名词性从句是指在句中充当名词的成分的从句，可以作主语、宾语、表语、同位语等。
名词性从句的引导词有“从属连词”和“连接代词”两种。
一、主语从句主语从句在句中充当主语，常引导主语从句的连接词有“that”和“whether/if”。
其中，“that”在口语中常省略，而“whether/if”则一般用于句中有“or not”时。
例如：1. That he passed the exam is good news.（非正式：He passed the exam is good news.）2. Whether he will come to the party is still uncertain.（非正式：If he will come to the party is still uncertain.）二、宾语从句宾语从句在句中充当宾语，常引导宾语从句的连接词有“that”、“whether/if”、“what”和“who/whom”。
其中，“that”在口语中常省略。
例如：1. She said that she would go shopping later.（非正式：She said she would go shopping later.）2. I don't know whether/if he is coming to the party.（非正式：I don't know if he is coming to the party.）3. She asked me what I wanted for dinner.4. He asked who/whom I was talking to on the phone.三、表语从句表语从句在句中充当表语，常引导表语从句的连接词有“that”、“whether/if”和“what”。
例如：1. The important thing is that we are safe.（非正式：The important thing is we are safe.）2. The question is whether/if he will pass the exam.3. The problem is what we should do next.四、同位语从句同位语从句通常用来进一步解释说明某个名词或代词指代的内容，引导同位语从句的连接词有“that”、“whether/if”、“what”、“who/whom”等。
名词性从句的语法结构与用法
名词性从句的语法结构与用法名词性从句是在句中充当名词的从句，它可以充当主语、宾语、表语或同位语。
名词性从句在句子中起着非常重要的作用，掌握其语法结构和用法十分必要。
一、主语从句主语从句是指充当主语的名词性从句。
常见的引导主语从句的词有：1. 从属连词that：That he is innocent is beyond doubt.（他的清白是毋庸置疑的）2. 连接代词what：What she said is true.（她说的是真的）3. 连接副词whether：Whether he can pass the exam remains to be seen.（他能否通过考试还有待观察）4. 连接副词if：If it rains tomorrow, we will stay at home.（如果明天下雨，我们会呆在家里）二、宾语从句宾语从句是指充当动词或介词宾语的名词性从句。
常见的引导宾语从句的词有：1. 从属连词that：We know that he is a good student.（我们知道他是个好学生）2. 连接代词what：She doesn't understand what you mean.（她不明白你的意思）3. 连接代词who/whom：I will tell them who is responsible for this.（我会告诉他们谁对此负责）4. 连接副词when：I can't remember when I met him.（我记不得我什么时候见过他）三、表语从句表语从句是指充当表语的名词性从句。
常见的引导表语从句的词有：1. 从属连词that：His biggest dream is that he can travel around the world.（他最大的梦想是能环游世界）2. 连接代词what：The important thing is what you do, not what you say.（重要的是你做什么，而不是你说什么）3. 连接代词who/whom：The question is who will take over his position.（问题是谁会接任他的职位）四、同位语从句同位语从句是指与一个名词或代词作同位关系的名词性从句。
名词性从句语法总结
名词性从句语法总结名词性从句是复合句中的一种从句类型，其在句中担当名词的成分。
名词性从句可以在句中充当主语、宾语、表语或同位语等。
本文将对名词性从句的语法和使用进行总结。
名词性从句的种类：1. 主语从句：名词性从句作为句子的主语。
例句：What he said made me happy.（他说的话使我快乐。
）2. 宾语从句：名词性从句作为句子的宾语。
例句：I don't know what to do.（我不知道该做什么。
）3. 表语从句：名词性从句作为句子的表语。
例句：The important thing is that we try our best.（重要的是我们尽力。
）4. 同位语从句：名词性从句作为同位语修饰先行词。
例句：The fact that he passed the exam surprised me.（他通过考试的事实让我感到惊讶。
）名词性从句的引导词：名词性从句的引导词包括连接代词和连接副词。
常用的连接代词有：that, if, whether, who, whom, whose, which, what等；常用的连接副词有：when, where, why, how等。
不同的引导词在句中起到不同的作用，连接代词引导的名词性从句可以充当主语、宾语、表语和同位语，而连接副词引导的名词性从句通常只能充当宾语或表语。
名词性从句的语序：名词性从句的语序一般是陈述句的语序，即主语+谓语+宾语的顺序。
但是在宾语从句中，如果从句主语和主句宾语相同，可简化从句，只保留连接词和谓语，或者只保留谓语。
例如：I know I can do it.（我知道我能做到。
）名词性从句的时态和语气：名词性从句的时态可以根据上下文的需要和表示的意思来选择。
通常情况下，主句是现在时或将来时，名词性从句的时态也是现在时；主句是过去时，名词性从句的时态也是过去时。
名词性从句的语气可以是陈述语气、疑问语气或祈使语气，取决于引导词的关系代词形式和上下文的语境。
名词性从句 语法
名词性从句一、名词性从句的基本概念在复合句中起名词作用的从句叫名词性从句，包括作主语从句、表语从句、宾语从句和同位语从句。
(1)主语从句就是在复合句中作主语的从句。
主语从句常用that, whether, who, whom, whose, what, which, when, where, how, why, whatever, whoever等引导。
如：Whether he will be able to come remains a question. 他是否来还是问题。
That China is a great socialist country is well known. 众所周知，中国是一个伟大的社会主义国家。
注：为避免头重脚轻，使句子平衡，常用it作形式主语，而将主语从句后置。
如上述第二例常说成：It is well known that China is a great socialist country.但是，由连接代词what, whatever, whoever等引导的主语从句一般不能用形式主语。
如：What he found surprised me greatly. 他的发现使我非常吃惊。
Whoever is finished may rest. 凡是做完工的人都可以休息。
(2)表语从句就是在连系动词之后作表语的从句。
引导表语从句的连接除与引导主语从句的连接词外，还有as if，as though。
如：The question is whether he is able to do it alone. 问题是他能否单独做这件事。
It looks as if (though) it is going to snow. 天好像要下雪似的。
注意：要区分以下句式：1. that’s why+结果；that’s because+原因。
2. the reason why /for…is that…He is absent. That’s because he is ill. 他缺席，这是因为他生病了。
语法讲解：名词性从句
语法讲解：名词性从句语法讲解：名词性从句名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。
因此，名词性从句可分为主语从句、表语从句、宾语从句和同位从句。
一、引导名词性从句的连接词连接代词：who，whose， whom， what， which.有词义，在从句中担任成分，如主语、表语、宾语、或定语等。
2. 连接副词：when， where， why， how.有词义，在从句中担任成分，作状语。
连接词：that， whether，if， as if.that 无词义，在从句中不担任成分，有时可省略；if （whether）， as if虽有词义，但在从句中不担任成分。
注意：连接代词与连接副词在句中不再是疑问句，因而从句中谓语不用疑问式。
连接代词与连接副词在从句充当句子成分，连接词whether 和if（是否），as if （好像）在从句中不充当句子成分，只起连接作用。
根据句义，如果连接代词与连接副词，whether、if 和as if 都用不上时，才用that作连接词（that本身无任何含义）。
二、主语从句主语从句在复合句作主语。
g. Who will ga2. 用it作形式主语，主语从句放在句末。
g. It doesn‘t mauch wu willat引导主语从句时，不能省略。
g. That he suddenly fell ill last week made us surprised.三、表语从句表语从句在复合句中作表语，位于系动词之后。
g. The question was who could g2. 引导表语从句的连接词that有时可省去。
g. My idea is （that）we can gadlw四、宾语从句宾语从句在复合句中作宾语。
引导宾语从句的连词that一般可省略。
g. I hope （that）everything is all rig2. 介词之后的宾语从句，不可用which或if连接，要分别用what或 wg. I'd in wu'vd the work……I'd in what you've saidwhether与if都可以引导宾语从句，常可互换。
英语语法名词性从句
英语语法名词性从句在句子中起名词作用的句子叫名词从句。
名词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。
1. 引导名词性从句的连接词引导名词性从句的连接词可分为三类：连接词： that, whether ,if （不充当从句的任何成分）连接代词：what, whatever, who, whoever, whom, whose, which连接副词：when, where, how, why不可省略的连词：1. 介词后的连词2. 引导主语从句和同位语从句的连词不可省略。
例如：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。
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：1. whether引导主语从句并在句首2. 引导表语从句3. whether从句作介词宾语4. 从句后有"or not"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。
2. 名词性that-从句1）由从属连词that引导的从句叫做名词性that-从句。
That只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义。
名词性that-从句在句中能充当主语、宾语、表语、同位语和形容词宾语。
例如：主语：That he is still alive is sheer luck. 他还活着全靠运气。
名词性从句语法总结
名词性从句语法总结名词性从句是英语语法中的一种句子结构，它可以在句中充当名词的角色。
名词性从句分为主语从句、宾语从句、表语从句和同位语从句。
在本文中，将对这四种名词性从句进行详细总结和讨论。
一、主语从句主语从句是一个句子，充当主句的主语。
它可以回答“什么是……”的问题。
主语从句的引导词有that, whether, if, who, whom, whose, what, which, whatever, whoever, whichever等。
例如：1. That he won the race surprised everyone. (他赢得比赛让每个人都感到惊讶。
)2. Whether we should go camping or not is still under discussion. (我们是否应该去露营还在讨论中。
)3. Who will be the next president is still uncertain. (谁将成为下任总统仍然不确定。
)二、宾语从句宾语从句在句中充当及物动词或介词后面的宾语。
它可以回答“谁……”、“什么……”的问题。
宾语从句的引导词有that, whether, if, who, whom, whose, what, which, whatever, whoever, whichever等。
例如：1. I don't know what he wants to say. (我不知道他想说什么。
)2. She asked me if I could help her. (她问我是否能帮助她。
)3. They wonder whether it will rain tomorrow. (他们想知道明天是否会下雨。
)三、表语从句表语从句是一个句子，充当主句的表语。
它一般回答“怎么样……”的问题。
表语从句的引导词有that, whether, if, who, whom, whose, what, which等。
名词性从句(语法)
名词性从句（Noun Clauses）主语从句，表语从句，宾语从句和同位语从句在复合句中的作用，相当于名词，因此这四种从句统称为名词性从句。
引导名词性从句的连接词按其在从句中的作用分为：1. 连接代词：who(ever), what(ever), which(ever), whom(ever), whose2. 连接副词：when, where, why, how3. 连接词：that, whether, if主语从句(The Subject Clause)主语从句在复合句中作主语。
whether 引导主语从句，置于句首时，不用if代替。
当主语从句结构，意义完整时，用that 引导，that置于句首时，不可省略。
但常常为了保持句子结构平衡，避免头重脚轻，用it作形式主语，把真正主语后置。
常用句型有四种：◇It + be + adj. + that从句◇It + be + 名词词组+ that从句(常见名词词组有：a pity, a shame, an honor, a pleasure, a surprise, no wonder等)◇It + be + 过去分词+ that从句(常见过去分词有：said, reported, thought, believed, told, unknown, expected等)◇It + seem/appear/happen/turn out…+ that从句1. That the country should build a nuclear power station is something we must discuss.2. It is certain that fuels like coal and oil cause a lot of pollution.3. It is a pity that you missed the sports meeting last week.4. It is thought that between 1550 and 1950 an average of one kind of living thing died out each year.5. Whether she will come or not is still a question.6. What we need is more time. (Is what we need more time?)(不能用it作形式主语)7. Which team will win the match remains unknown.8. When they will start has not been decided yet.9. How he became a great scientist is known to all.10. Whatever is worth doing is worth doing well. (不能用it作形式主语)表语从句(The Predicative clause)位于主句中系动词之后，在主句中充当表语的从句叫表语从句。
名词性从句的语法结构详解
名词性从句的语法结构详解名词性从句是从句在句中充当名词的作用。
它可以在句子中充当主语、宾语、表语或同位语，并起到衔接句子结构的作用。
在英语语法中，名词性从句有三种类型：主语从句、宾语从句和表语从句。
本文将详细介绍这三种名词性从句的语法结构。
1. 主语从句主语从句在句中作主语，用来引导主句的动作或状态。
主语从句一般由连接词 that 引导，也可以由连接词 whether 或 if 来引导。
以下是几个例子：- That he is innocent is obvious. （他无辜是显而易见的。
）- If it rains, we will stay indoors. （如果下雨，我们会呆在室内。
）2. 宾语从句宾语从句在句中作宾语，用来接受主句动作的影响或承载主句的意义。
宾语从句一般由连接词 that 引导，也可以由连接词whether 或 if 来引导。
以下是几个例子：- He said that he loves her. （他说他爱她。
）- She asked if I had finished my homework. （她问我是否完成了我的作业。
）3. 表语从句表语从句在句中作表语，用来给主语指定属性或状态。
表语从句一般由连接词 that 引导，也可以由连接词 whether 或 if 来引导。
以下是几个例子：- The fact that he lost the game is disappointing. （他输掉比赛的事实令人失望。
）- His biggest concern is whether the project will be successful. （他最大的担忧是这个项目是否会成功。
）- Her hope is that she can travel the world. （她的希望是能够环游世界。
）总结名词性从句是英语语法中重要的语法结构之一，用于引导从句充当句子成分。
名词性从句语法
名词性从句名词性从句分为：宾语从句、表语从句、主语从句、同位语从句后面所跟的三种形式：a.陈述句（that）b.一般疑问句（whether/ if +陈述句）c.特殊疑问句（wh- +陈述句）注：三种形式不能同时使用, 且从句必须用陈述语序（除了宾语从句中的Can you tell me what’s the matter /wrong/trouble with you ?一、主语从句（1）that 从句作主语（It 作形式主语）a.It is adj. that……(necessary/ important/ obvious/ clear/ likely/ possible/ certain……)b.It is n. that……(common knowledge/ a fact/ a pity/ a shame/ a surprise/ no wonder…..)c.It is done (过分) that……( said/ believed/ reported/ hoped/ claimed/ known/ suggested/announced……) = sb./sth. be said to do/ have done/ be doing……..d.It 不及物动词that……( seem/ appear/ happen/ occur/ turn out…….) = sb/ sth. seem todo/have done/ be doing…..) 此句型无被动（2）wh-从句作主语a.在主语从句中只能用whether，不能用if.b.Wh- 从句作主语时，也常用it 作形式主语的结构，而将wh-从句至于句尾。
Eg: It has not been decided who will leave for Beijing.It remains unknown whether he will join us.It is up to you to decide who will be sent abroad.c.Wh- 从句也可以直接放在句首作主语。
语法总结名词性从句归纳
语法总结名词性从句归纳名词性从句是指在句子中充当名词作用的从句，它可以充当主语、宾语、表语、同位语等。
名词性从句的引导词有很多，如that, whether, if, what, whoever, whichever, whoever等。
下面将对名词性从句的引导词及其用法进行总结归纳。
一、名词性从句作主语名词性从句作主语时，常用that引导。
例如：1. That you have finished your homework surprises me.2. That she loves him is known to all.3. It is strange that he hasn't arrived yet.二、名词性从句作宾语1. that引导的宾语从句例如：He told us that he would come back soon.I'm afraid that I can't go with you.2. if / whether引导的宾语从句例如：I don't know whether/if he can pass the exam.Please ask him if/whether he needs any help.3. 疑问词引导的宾语从句例如：Can you tell me what time it is?She asked me where I was going.三、名词性从句作表语名词性从句作表语常用that引导。
例如：1. The truth is that he didn't tell the truth.2. His suggestion is that we should go there by car.四、名词性从句作同位语名词性从句作同位语时常用that引导。
例如：1. The news that he won the prize made us all happy.2. I don't know the fact that she has moved to another city.五、特殊情况1. Whether引导的名词性从句表达两种选择或对比的意思。
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主语从句定义：在复合句中充当主语成分的句子叫做主语从句。
主语从句主要有三类：(1)由连词that引导的主语从句引导词that无含义，在句中不做成分，不可以省。
e.g. That you will win the medal seems unlikely. That you are so indifferent bothers me.That she survived the accident is a miracle.(2)由连词whether引导的主语从句whether有含义(是否)，在句中不做成分，不可以省略。
e.g. Whether she is coming or not doesn’t matter too much.(3)用连接代词引导的主语从句(在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分)e.g. What we need is time. What I want to know is this.Whatever you did is right. (主语从句大部分情况看成第三人称单数形式)What we need are good doctors. (主语从句有时可以根据表语来判断单复数问题)Whoever comes is welcome.翻译：谁将会成为我们的班长仍然还没有确定。
(4)用连接副词when, where, why, how, wherever, whenever引导的名词性从句(其连接副词有含义，在句中作状语)e.g. When they will come hasn’t been made public.翻译：他们在哪里举办运动会仍然是个问题。
it作形式主语1. it做形式主语，而将主语从句放在句末(尤其是当谓语较短时)e.g. That light travels in straight lines is known to all.= It is known to all that light travels in straight lines.When the plane is to take off has not been announced.= It has not been announced when the plane is to take off.(当what引导的主语从句表示“...的东西”时，一般不用it作形式主语)e.g. What he wants is a book. ≠ It is a book what he wants.2. 当that引导的主语从句出现在疑问句中时，要以it做形式主语，而把主语从句后置。
e.g. Is it true that Tom will give us a lecture next week?翻译：他们明天不来要紧吗？Does it matter that they will not come tomorrow?3.当主语从句出现在感叹句中时，要以it做形式主语，而把主语从句后置。
How strange it is that the children are so quite!4.固定用法a. It be +名词(a pity, a fact, no wonder, common knowledge, a question...)+从句e.g. It is a pity that we can’t go.b. It be + adj. (obvious, true, necessary, good, clear, strange...) +从句e.g. It is certain that she will pass the exam.c. It be +过去分词(said, reported, thought, expected, decided, announced...)+从句e.g. It is said that Tom has arrived in Beijing.It is thought that she is the best player.d. It seems/ happens等不及物动词及短语+that从句e.g. It seems that Tom isn’t coming to the party.It happened that I was out that day.注意：(1)常用whether引导主语从句e.g. Whether she will go home or not is unknown.(2) what与that在引导主语从句时的区别what引导主语从句时在从句中充当句子成分，如主语，宾语，表语，而that则不然。
e.g. What you said yesterday is right.That they were sisters was clear.(3)在有些that从句中要用虚拟语气(should do/ should have done)e.g. It is strange that he should do that.It is important that we should attend the meeting.宾语从句学习宾语从句要抓住三要素：连接词，语序和时态。
一、定义宾语从句在复合句中起宾语的作用，可以做动词的宾语，也可以做介词的宾语。
e.g. He said (that) he would like to see the headmaster.及物动词宾语从句二、引导宾语从句的词1. 连词：that, whether, if2. 连接代词：what, whatever, who, whoever, which, whichever等3. 连接副词：when, where, why, how等三、that1. that在从句中不充当成分，本身没有词义，可以省略。
这类句子通常由陈述句变来。
e.g. He says ( that ) Jim may fail the Chinese exam.2. that只在except, in和but等少数介词后引导从句做介词的宾语。
e.g. We know nothing except that Joe is from America.He differed from other people in that he always looked further ahead in his work.他和别人不同的是他在工作中比别人都看得远些。
I could say nothing but that I was sorry.3. that在下列情况中不能省略a.在连接词and或but所连接的两个作宾语的that从句中，第一个宾语从句中的that可以省略，第二个不能省略。
e.g. He said (that) he has worked for nearly ten years and that he wanted to go home.b.当主句的谓语动词与that宾语从句之间有插入语时，that一般不可省。
Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.c. 当it作形式宾语时e.g. She made it clear that she had nothing to do with him．许多带复合宾语的句子，that引导的宾语从句经常移到句子后部，而用it作形式宾语。
四、whether/ if当由一般疑问句充当宾语从句时，用if或whether引导，意为“是否”。
e.g. I don't know if／whether he still lives here after so many years．我不知道这么多年后他是否还住在这儿。
但在下列情况下只能用whether：①在具有选择意义，又有or或or not时，尤其是直接与or not连用时，往往用whether。
如：Let me know whether he will come or not．（＝Let me know whether or not he will come）让我知道他是否能来。
I don't know whether he does any washing or not．（＝I don't know whether or not he does any washing．）我不知道他洗不洗衣服。
I wonder whether we stay or whether we go．我不知道我们是去还是留。
②在介词之后用whether。
如：I'm interested in whether he likes English．我关心的是他是否喜欢英语。
We're thinking about whether we can finish the work on time．我们正在考虑是否能按时完成这项工作。
I worry about whether I hurt her feelings．我担心是否伤了她的感情。
③在不定式前用whether。
如：He hasn't decided whether to visit the old man．他尚未决定是否拜访那位老人。
I don't know whether to go．我不知去否。
He hasn't decided whether to go by bus or by train．他还未决定是乘公共汽车去还是坐火车去。
④whether置于句首时，不能换用if。
如：Whether this is true or not，I can't say．这是否真的我说不上来。
⑤引导主语从句和表语从句时宜用whether。
如：Whether she will come or not is still a question．她是否能来还是个问题。
The question is whether we can catch the bus．问题是我们能否赶上公共汽车。
⑥若用if会引起歧义时，则用whether。
如：Please let me know if you like the book．可理解为：a．Please let me know whether you like the book．请告诉我你是否喜欢这本书。