名词性从句为什么没有定语从句和状语从句啊?
明天老师要我上台介绍名词性从句，我不懂怎么说啊？能不能大概告诉我一些名词性从句的结构，或者典型例子`````````````...
明天老师要我上台介绍名词性从句，我不懂怎么说啊？能不能大概告诉我一些名词性从句的结构，或者典型例子`````````````
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名词性从句，简言之就是作用相当于一个名词，那么想一想名词在英文中都能充当那些成分呢？
很容易就想到主语，宾语，表语，宾补，还有一个同位语
在英语中当这些成分是由一个句子来充当的时候，就产生了我们的名词性从句，不过请注意，英语中没有句子做宾补的情况。那么名词性从句就包含四类：主语从句，宾语从句，表语从句，同位语从句
例1. (That the most important duty of the gocernment is to improve the living stadand of its people) 主语从句has long been universally acknowledged.
2. I don't care (who you were before) 宾语从句；(What I really care) 主语从句
is (who will you become in the future)表语从句（即放在系动词后的从句）.
3. All of the people burst into tears when the news came (that a black had won the campaign),这是news 的同位语，解释说明news 的具体内容。.
很容易就想到主语，宾语，表语，宾补，还有一个同位语
在英语中当这些成分是由一个句子来充当的时候，就产生了我们的名词性从句，不过请注意，英语中没有句子做宾补的情况。那么名词性从句就包含四类：主语从句，宾语从句，表语从句，同位语从句
例1. (That the most important duty of the gocernment is to improve the living stadand of its people) 主语从句has long been universally acknowledged.
2. I don't care (who you were before) 宾语从句；(What I really care) 主语从句
is (who will you become in the future)表语从句（即放在系动词后的从句）.
3. All of the people burst into tears when the news came (that a black had won the campaign),这是news 的同位语，解释说明news 的具体内容。.
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句子成分中名词做的成分是主，宾，表语，如果是一个句子做主、宾、表语，就叫做主语从句、宾语从句和表语从句，因为是名词做的成分，所以叫名词性从句。定语从句是一个句子做定语，而定语是形容词做的，所以定语从句是形容词性从句。状语从句是做状语的，而状语是副词做的，所以状语从句也叫副词从句。明白？
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（宾语从句
宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词（及物动词）或介词之后。
定语从句及相关术语
1.定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。）
名词性从句是由if, whether, that 和各种疑问词充当连接词所引导的从句，其功同名词一样。
主语从句
主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
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。被强调部分指人是也可用who/whom。例如：
It is a pity that you didn’t go to see the film.
It doesn’t interest me whether you succeed or not.
It is in the morning that the murder took place.
It is John that broke the window.
2. 用it 作形式主语的结构
(1) It is ＋名词＋从句
It is a fact that … 事实是…
It is an honor that …非常荣幸
It is common knowledge that …是常识
(2) it is ＋形容词＋从句
It is natural that… 很自然…
It is strange that… 奇怪的是…
(3) it is ＋不及物动词＋从句
It seems that… 似乎…
It happened that… 碰巧…
(4) it ＋过去分词＋从句
It is reported that… 据报道…
It has been proved that… 已证实…
3. 主语从句不可位于句首的五种情况
(1) if 引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。例如：
It is said that President Jingo will visit our school next week. (right)
That President Jiang will visit our school next week is said. (wrong)
(3) It happens…, It occurs… 结构中的主语从句不可提前。例如：
It occurred to him that he failed in the examination. (right)
That he failed in the examination occurred to him. (wrong)
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如：
It doesn’t matter whether he is wrong or not. (right)
Whether he is wrong or not doesn’t matter. (wrong)
(5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如：
Is it likely that it will rain in the evening? (right)
Is that will rain in the evening likely? (wrong)
4. What 与that 在引导主语从句时的区别
What 引导主语从句时在句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如：
1) What you said yesterday is right.
2) That she is still alive is a consolation.
宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词（及物动词）或介词之后。
定语从句及相关术语
1.定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。）
名词性从句是由if, whether, that 和各种疑问词充当连接词所引导的从句，其功同名词一样。
主语从句
主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
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。被强调部分指人是也可用who/whom。例如：
It is a pity that you didn’t go to see the film.
It doesn’t interest me whether you succeed or not.
It is in the morning that the murder took place.
It is John that broke the window.
2. 用it 作形式主语的结构
(1) It is ＋名词＋从句
It is a fact that … 事实是…
It is an honor that …非常荣幸
It is common knowledge that …是常识
(2) it is ＋形容词＋从句
It is natural that… 很自然…
It is strange that… 奇怪的是…
(3) it is ＋不及物动词＋从句
It seems that… 似乎…
It happened that… 碰巧…
(4) it ＋过去分词＋从句
It is reported that… 据报道…
It has been proved that… 已证实…
3. 主语从句不可位于句首的五种情况
(1) if 引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。例如：
It is said that President Jingo will visit our school next week. (right)
That President Jiang will visit our school next week is said. (wrong)
(3) It happens…, It occurs… 结构中的主语从句不可提前。例如：
It occurred to him that he failed in the examination. (right)
That he failed in the examination occurred to him. (wrong)
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如：
It doesn’t matter whether he is wrong or not. (right)
Whether he is wrong or not doesn’t matter. (wrong)
(5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如：
Is it likely that it will rain in the evening? (right)
Is that will rain in the evening likely? (wrong)
4. What 与that 在引导主语从句时的区别
What 引导主语从句时在句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如：
1) What you said yesterday is right.
2) That she is still alive is a consolation.
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顾名思义 名词性从句时充当名词成分的句子 怎么可能会有定/状语从句呢 定语从句相当于一个句子做定语 按词性来说是形容词性的 状语从句也是修饰性的从句 相当于简单句中的副词啦 名词性从句比较常见的有 主语从句 宾语从句 表语从句 同位语从句 具体用法结构可参照百度百科 http://baike.baidu.com/view/414544.htm
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