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详细举例讲一讲各种英语从句的用法
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）
主语从句的3种常用基本结构
先啰嗦一下如何分析句子结构：
第一步找句子中的动词，如果只有一个，那肯定是简单句；如果有二个，或两个以上，那就可能是并列句或复合句
第二步找连词，如果有并列连词，比如and, but, so 等等，那肯定有并列句
如果还有从属连词，那肯定存在复合句
复合句包括：1、名词性从句：主语从句，表语从句，宾语从句和同位语从句
2、形容词性从句：定语从句
3、副词性从句：状语从句
你还要知道几个结构：主谓（谓语动词之前是主语）
动宾、介宾（谓语动词或介词之后是宾语）
系表（系动词之后是表语）
那么如何分从句，还是要先找连词，然后看从句在句子中充当什么成分，但是你首先要知道各个复合句都有哪些连词，而且名称也不同哦。
1 在名词性从句中，引导从句的连词被称为连接词、连接代词、连接副词，
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
下面举例：
That our team won the game made us happy.
(主语从句，That our team won the game 在句子中充当主语)
We heard the news that our team won the game.
（同位语从句，that our team won the game在句子中充当the news的同位语)
My question is who will finish the work.
（表语从句，who will finish the work在句子中充当is后的表语)
2 在定语从句中，引导从句的连词被称为关系代词和关系副词，一般来说，定语从句都是跟在名词之后的，那个名词叫先行词。如果你没有找到被修饰的名词，那肯定不是定语从句。
This is the mountain village where I stayed last year. 这是我去年呆过的山村。
This is the mountain village that I visited last year. 这是我去年参观过的山村。
3 在状语从句中，一般都会有逗号，这时初中内容，多看些例句：
I didn't go, because I was afraid. 我不去是因为我怕。
Although it's raining, they are still working in the field. 虽然在下雨，但他们仍在地里干活。
其实最好的办法，就是把分析句子结构的方法记得，然后多看例句，多多自己分析，多问自己的老师，相信你一定能掌握。
都是自己敲得，希望对你有帮助，忘采纳!
宾语从句陈述语句结构是什么?
宾语从句的语序是陈述句语序即：连接代词/副词+主语+谓语+其他成分。即：连接代词/副词+陈述句语序。例句如下：
1、I don’t know what they are looking for.
2、Could you tell me when the train will leave?
3、Can you imagine what kind of man he is?
宾语从句特点：
1、宾语从句可以作及物动词、介词及形容词的宾语。
2、宾语从句的语序一律用陈述句语序。
3、连接词that引导宾语从句在句中无词义，不充当句子成分，口语中一般可以省略。
4、whether 和 if 都可引导宾语从句，但 whether后可紧跟or not；whether从句可作介词的宾语。当if/whether引导宾语从句时，在从句中不做任何成分，但有具体的含义，意为“是否”。if/whether不能省略。
英语的状语从句都有哪些类型
用来修饰谓语动词、其它动词、定语、状语或整个句子的从句叫做状语从句。状语从句可分为：
1.时间状语从句2.地点状语从句；3.原因状语从句；4.条件状语从句；5.目的状语从句；6.让步状语从句；7.比较状语从句；8.程度状语从句；9.方式状语从句；10.结果状语从句。
状语从句一般由连词(从属连词)引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。
eg:As
soon
as
I
have
finished
this
work,
I
will
go
home.
宾语从句：主语＋某些可以接从句的及物动词＋从句
eg:I
hope
that
I
can
be
a
successful
man
in
the
future.
楼主没有谓语从句
表语从句：关联词+简单句
The
problem
is
how
we
can
get
the
things
we
need.
定语从句：修饰名词或代词的从句
The
man
who
is
talking
with the
headmaster
is
my
Dad.
同位语从句:用来补充说明前面的词
The
suggestion
that we
will
climb
the
moutain
is
admitted.
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