如何判断一个句子是宾语从句还是定语从句还是名词性从句
2个回答
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在复合句中，修饰一个名词或代词的从句叫做定语从句。被定语从句所修饰的词叫先行词。定语从句必须放在先行词之后。引导定语从句的词叫关联词。
〔关联词〕
常见的关联词有关系代词that,which,who,whom,whose和关系副词where,when,why等。
〔种类〕
1.由that引导的定语从句
一般情况下that可指人或物，可以代替who， whom和which，在从句中作主语或谓语动词的宾语，但不能作介词的宾语。如：
The comrade that(who)is speaking at the meeting is an advanced worker.正在会上讲话的那个同志是个先进工人。
Is this the doctor that(whom)you talked about yesterday？这就是你们昨天谈论的那位医生吗？
The letter that(which)I received yesterday was from my father.昨天我收到的信是我父亲寄来的。
2.由who，whom和whose引导的定语从句
who在从句中作主语，whom在从句中作宾语， whose在从句中作定语。如：
This is the thief who stole my bike.这就是偷我自行车的那个贼。
He is the boy whom you wanted to find.他就是你想要找的那个男孩。
The girl whose mother is a doctor is waiting for you outside.妈妈是个医生的那个女孩在外面等你。
3.由which引导的定语从句
which指物，在从句中作主语或谓语动词的宾语。如：
The book which Mum bought me last week is called"Red Star Over China".妈妈上周买给我的那本书名叫《西行漫记》。
The house which Lu Xun once lived in is now the Lu Xun Museum.鲁迅曾经住过的那所房子现在是鲁迅博物馆。
4.由where，when和why引导的定语从句
where在从句中作地点状语，when在从句中作时间状语，why在从句中作原因状语。如：
I will never forget the day when I joined the League.我永远忘不了我入团的那一天。
He will go back to the school where he studied next week.下周他要回到他曾经学习过的学校。
I don't know the reason why he quarreled with Zhang Lin.我不知道他同张琳吵架的原因。
〔注意点〕
关系代词在定语从句中作宾语时，关系代词常省去。如：The play(which)I watched just now had been on twice on Channel 3.我刚才看的那个戏剧在3频道上已上演了两次。
参考资料： http://edu.sina.com.cn/en/2004-01-04/17947.html
公式：主语＋某些可以接从句的及物动词＋从句（这里的从句就是宾语从句）
可以接宾语从句的动词常用的有：say 、tell 、think、 know、 see、 hear、 hope、 guess、 find、 feel 等，或由形容词构成的系表结构，如：afraid、 sure、 glad、 sorry等
宾语从句的时态与主句时态的呼应问题。
① 主句谓语动词如果是现在时或将来时，宾语从句的时态可以是任何所需要的时态，如：
I know he didn't come. 我知道他没来。
I know he will come tomorrow. 我知道他明天来。
I know he has gone to London. 我知道他已去伦敦了。
I wanted to know when he would come.
� The teacher told me the earth moves around the sun.
参考资料： http://q.163.com/feian/blog/chuanliguo2000/46779206200821553036189/#46779206200821553036189
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。
一．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.
二．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。
1. 作动词的宾语
(1) 由that引导的宾语从句（that 通常可以省略）,例如：
I heard that be joined the army.
(2) 由what, whether (if) 引导的宾语从句，例如：
1) She did not know what had happened.
2) I wonder whether you can change this note for me.
(3) 动词＋间接宾语＋宾语从句。例如：
She told me that she would accept my invitation.
2. 作介词的宾语
例如：Our success depends upon how well we can cooperate with one another.
3. 作形容词的宾语
例如：I am afraid (that) I’ve made a mistake.
That 引导的从句常跟在下列形容词后作宾语：
Anxious, aware, certain, confident, convinced, determined, glad, proud, surprised, worried, sorry, thankful, ashamed, disappointed, annoyed, pleased, hurt, satisfied, content 等。也可以将此类词后的that 从句的看作原因状语从句。
4. It 可以作为形式宾语
It 不仅可以作为形式主语，还可以作为形式宾语而真正的宾语that 从句则放在句尾，特别是在带复合宾语的句子中。 例如：
We heard it that she would get married next month..
5. 后边不能直接跟that 从句的动词
这类动词有Allow, refuse, let, like, cause, force, admire, condemn, celebrate, dislike, love, help, take, forgive等。这类词后可以用不定式或动名词作宾语，但不可以用that引导的宾语从句。例如：
I admire their winning the match. (right)
I admire that they won the match. (wrong)
6. 不可用that从句作直接宾语的动词
有些动词不可用于“动词＋间接宾语＋that从句“结构中，常见的有Envy, order, accuse, refuse, impress, forgive, blame, denounce, advise, congratulate等。例如：
He impressed the manager as an honest man. (right)
He impressed the manager that he was an honest man. (wrong)
7. 否定的转移
若主句谓语动词为Think, consider, wuppose, believe, expect, fancy, guess, imagine等，其后的宾语从句若含有否定意义，一般要把否定词转移到主句谓语上，从句谓语用肯定式。例如：
I don’t think this dress fits you well.（我认为这件衣服不适合你穿。）
三．表语从句
表语从句在复合句中作表语的名词性从句，放在系动词之后，一般结构是“主语＋连系动词＋表语从句”。可以接表语从句的连系动词有be, look, remain, seem等。引导表语从句的that常可省略。另外，常用的还有the reason is that… 和It is because 等结构。例如：
1) The question is whether we can make good preparation in such a short time.
2) This is why we can’t get the support of the people
3) But the fact remains that we are behind the other classes.
4) The reason he is late for school is that he missed the early bus.
四．同位语从句
同位语从句就是在复合句中作名词的同位语的名词性从句。
1. 同位语从句的功能
同位语从句对于名词进一步解释，说明名词的具体内容，一般由that引导，例如：
1) The king’s decision that the prisoner would be set free surprised all the people.
2) The order that all the soldiers should stay still is given by the general.
2. 同位语在句子中的位置
同位语从句有时可以不紧跟在它所说明的名词后面，而是被别的词隔开。例如：
He got the news from Mary that the sports meeting was put off.
3. 同位语从句与定语从句的区别
(1) 定语从句中的that既代替先行词，同时以在从句中作某个成分（主语或宾语），而同位语从句中的that是连词，只起连接主句与从句的作用，不充当句中任何成分。
(2) 定语从句是形容词性的，其功能是修饰先行词，对先行词加以限定，描述定的性质或特征；同位语从句是名词性的，其功能是对名词进行补充说明。例如：
1) The news that he told me is that Tom would go abroad next year.（他告诉我的消息是汤姆明年将出国。）（第一个that引导的从句是定语从句，that在从句中作宾语）
2)The news that Tom would go abroad is told by him.（汤姆将出国的消息是他讲的。）（同位语从句，that在句中不作任何成分）
〔关联词〕
常见的关联词有关系代词that,which,who,whom,whose和关系副词where,when,why等。
〔种类〕
1.由that引导的定语从句
一般情况下that可指人或物，可以代替who， whom和which，在从句中作主语或谓语动词的宾语，但不能作介词的宾语。如：
The comrade that(who)is speaking at the meeting is an advanced worker.正在会上讲话的那个同志是个先进工人。
Is this the doctor that(whom)you talked about yesterday？这就是你们昨天谈论的那位医生吗？
The letter that(which)I received yesterday was from my father.昨天我收到的信是我父亲寄来的。
2.由who，whom和whose引导的定语从句
who在从句中作主语，whom在从句中作宾语， whose在从句中作定语。如：
This is the thief who stole my bike.这就是偷我自行车的那个贼。
He is the boy whom you wanted to find.他就是你想要找的那个男孩。
The girl whose mother is a doctor is waiting for you outside.妈妈是个医生的那个女孩在外面等你。
3.由which引导的定语从句
which指物，在从句中作主语或谓语动词的宾语。如：
The book which Mum bought me last week is called"Red Star Over China".妈妈上周买给我的那本书名叫《西行漫记》。
The house which Lu Xun once lived in is now the Lu Xun Museum.鲁迅曾经住过的那所房子现在是鲁迅博物馆。
4.由where，when和why引导的定语从句
where在从句中作地点状语，when在从句中作时间状语，why在从句中作原因状语。如：
I will never forget the day when I joined the League.我永远忘不了我入团的那一天。
He will go back to the school where he studied next week.下周他要回到他曾经学习过的学校。
I don't know the reason why he quarreled with Zhang Lin.我不知道他同张琳吵架的原因。
〔注意点〕
关系代词在定语从句中作宾语时，关系代词常省去。如：The play(which)I watched just now had been on twice on Channel 3.我刚才看的那个戏剧在3频道上已上演了两次。
参考资料： http://edu.sina.com.cn/en/2004-01-04/17947.html
公式：主语＋某些可以接从句的及物动词＋从句（这里的从句就是宾语从句）
可以接宾语从句的动词常用的有：say 、tell 、think、 know、 see、 hear、 hope、 guess、 find、 feel 等，或由形容词构成的系表结构，如：afraid、 sure、 glad、 sorry等
宾语从句的时态与主句时态的呼应问题。
① 主句谓语动词如果是现在时或将来时，宾语从句的时态可以是任何所需要的时态，如：
I know he didn't come. 我知道他没来。
I know he will come tomorrow. 我知道他明天来。
I know he has gone to London. 我知道他已去伦敦了。
I wanted to know when he would come.
� The teacher told me the earth moves around the sun.
参考资料： http://q.163.com/feian/blog/chuanliguo2000/46779206200821553036189/#46779206200821553036189
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。
一．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.
二．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。
1. 作动词的宾语
(1) 由that引导的宾语从句（that 通常可以省略）,例如：
I heard that be joined the army.
(2) 由what, whether (if) 引导的宾语从句，例如：
1) She did not know what had happened.
2) I wonder whether you can change this note for me.
(3) 动词＋间接宾语＋宾语从句。例如：
She told me that she would accept my invitation.
2. 作介词的宾语
例如：Our success depends upon how well we can cooperate with one another.
3. 作形容词的宾语
例如：I am afraid (that) I’ve made a mistake.
That 引导的从句常跟在下列形容词后作宾语：
Anxious, aware, certain, confident, convinced, determined, glad, proud, surprised, worried, sorry, thankful, ashamed, disappointed, annoyed, pleased, hurt, satisfied, content 等。也可以将此类词后的that 从句的看作原因状语从句。
4. It 可以作为形式宾语
It 不仅可以作为形式主语，还可以作为形式宾语而真正的宾语that 从句则放在句尾，特别是在带复合宾语的句子中。 例如：
We heard it that she would get married next month..
5. 后边不能直接跟that 从句的动词
这类动词有Allow, refuse, let, like, cause, force, admire, condemn, celebrate, dislike, love, help, take, forgive等。这类词后可以用不定式或动名词作宾语，但不可以用that引导的宾语从句。例如：
I admire their winning the match. (right)
I admire that they won the match. (wrong)
6. 不可用that从句作直接宾语的动词
有些动词不可用于“动词＋间接宾语＋that从句“结构中，常见的有Envy, order, accuse, refuse, impress, forgive, blame, denounce, advise, congratulate等。例如：
He impressed the manager as an honest man. (right)
He impressed the manager that he was an honest man. (wrong)
7. 否定的转移
若主句谓语动词为Think, consider, wuppose, believe, expect, fancy, guess, imagine等，其后的宾语从句若含有否定意义，一般要把否定词转移到主句谓语上，从句谓语用肯定式。例如：
I don’t think this dress fits you well.（我认为这件衣服不适合你穿。）
三．表语从句
表语从句在复合句中作表语的名词性从句，放在系动词之后，一般结构是“主语＋连系动词＋表语从句”。可以接表语从句的连系动词有be, look, remain, seem等。引导表语从句的that常可省略。另外，常用的还有the reason is that… 和It is because 等结构。例如：
1) The question is whether we can make good preparation in such a short time.
2) This is why we can’t get the support of the people
3) But the fact remains that we are behind the other classes.
4) The reason he is late for school is that he missed the early bus.
四．同位语从句
同位语从句就是在复合句中作名词的同位语的名词性从句。
1. 同位语从句的功能
同位语从句对于名词进一步解释，说明名词的具体内容，一般由that引导，例如：
1) The king’s decision that the prisoner would be set free surprised all the people.
2) The order that all the soldiers should stay still is given by the general.
2. 同位语在句子中的位置
同位语从句有时可以不紧跟在它所说明的名词后面，而是被别的词隔开。例如：
He got the news from Mary that the sports meeting was put off.
3. 同位语从句与定语从句的区别
(1) 定语从句中的that既代替先行词，同时以在从句中作某个成分（主语或宾语），而同位语从句中的that是连词，只起连接主句与从句的作用，不充当句中任何成分。
(2) 定语从句是形容词性的，其功能是修饰先行词，对先行词加以限定，描述定的性质或特征；同位语从句是名词性的，其功能是对名词进行补充说明。例如：
1) The news that he told me is that Tom would go abroad next year.（他告诉我的消息是汤姆明年将出国。）（第一个that引导的从句是定语从句，that在从句中作宾语）
2)The news that Tom would go abroad is told by him.（汤姆将出国的消息是他讲的。）（同位语从句，that在句中不作任何成分）
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1. I think that it is important to learn English.这个句子含有一个名词性从句，在句中作think的宾语，因此that it is important to learn English就是宾语从句。2. This is the book whose cover is red.这个句子含有一个修饰名词the book的从句，且作定语，因此whose cover is red就是定语从句。
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