主语从句有哪些

主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what, which, whoever, whatever, whichever和连接副词when, where, why, how等.例如:
1、That she was chosen made us very happy.她当选了使我们很高兴.
2、What caused the accident is a complete mystery.是什么导致了这次事故还完全是一个谜.
3、Whether she will come or not is still a question.她是否来还是一个问题.
4、Which team will win the match is still unknown.哪个队会赢得这场比赛还不知道.
5、Whoever comes to the party will receive a present.参加聚会的每一个人都将收到一份礼物.
6、When they will start has not been decided yet.他们何时出发还没决定.
注意:上述例句中的主语从句都是放在句首,但有时为了使句子结构平衡,避免"头重脚轻",常用it作形式主语,而把从句放在后面.例如:
It is a pity that she has made such a mistake.她犯了这样一个错误,真是遗憾.
It depends on the climate whether they are going shopping today.他们是否今天去购物还得看天气情况.
这样就构成了下面一些常用句型:
1)It is + adj. / n. +从句
It is a pity/shame that...遗憾的是……
It is possible that...很可能……
It is unlikely that...不可能……
2)It +不及物动词+从句
It seems/appears that...似乎……
It happened that...碰巧……
3)It + be +过去分词+从句
It is said that...据说……
It is known to all that...众所周知……
It is reported that...据报道……
It is believed that...据信……;人们相信……
It is suggested that...有人建议……
It must be pointed out that...必须指出……
It has been proved that...已证明…….例如:
It is believed that at least a score of buildings were damaged or destroyed.据信,至少有二十座楼房遭到破坏或彻底毁掉.
It is suggested that the meeting should be put off.有人建议会议延期召开.
It's reported that three people were killed in the accident and five were hurt badly.据报道,事故中三人丧生,五人重伤.
It is known to all that Taiwan is an inseparable part of China.众所周知,台湾是中国不可分割的一部分.
扩展资料
宾语从句用以区分 主语从句的几个特征：
1、 引导词：what\which\whose\when\whether\if\where
2 语序：宾语从句必须是用陈述语句。（名词性从句都是陈述语序）
如：I think that you must work harder.
宾语从句的引导词、 连接词的区别、 否定转移等现象。
补充： 从句的语序永远是 陈述句。

一、定义
在句子中担当主语的从句，就叫主语从句。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。
二、连接词
根据主语从句所缺句子成分的情况，主语从句会由不同的连接词连接，常见的连接词有：that、if/whether、连接代词、连接副词和what。
三、that引导的主语从句
（一）
当主语从句本身不缺成分时，就会使用that来连接。此时，that只起连接作用，但不能省略。如：
That he will come to our village tomorrow surprises us all. （他要来我们村，让我们都感到很惊讶。）That she used to be a spy is known to all. （大家都知道，她过去是个间谍。）
这种情况下，因为主语从句往往比谓语部分更长，会导致整个句子头重脚轻，所以经常会用it作为形式主语来替换主语从句，而把主语从句放到句末。此时，that也只起连接作用，但可以省略。比如，以上两个句子就存在这个问题，所以一般都会改为：
It surprises us all (that) he will come to our village tomorrow.It is known to all (that) she used to be a spy.
（二）
如果句子是疑问句，则必须用带形式主语it的结构。如：
That she is our English teacher is true. （她是我们的英语老师，是真的。）That he has been there twice is a fact. （他去过那儿两次了，是真的。）
这两句话如果改为一般疑问句时，不能这么改：
错误：Is that she is your English teacher true?错误：Is that he has been there twice a fact?
而是要改为含有形式主语it的句子：
Is it true that she is your English teacher?Is it a fact that he has been there twice?
（三）
在形式主语it引导的主语从句结构“It is+形容词/名词/名词短语等+that主语从句”中，如果is后面的表语是表示重要或必要等（如important、necessary、a necessity等）含义时，that从句中的谓语动词一般要采用“should+do”的虚拟语气形式，should经常省略。如：
It is imperative that we (should) make a quick decision. （我们要尽快做出决定。）It is necessary that we (should) learn English well. （我们必须学好英语。
四、if/whether引导的主语从句
当主语从句本身含有是否的意思时，连接词必须用if或whether。但是，如果主语从句位于句首时，只能用whether，不能用if。如：
Whether it will do good to us remains to be seen. （是否对我们有害还要看一看。）
这种情况下，因为主语从句也比较长，会导致头重脚轻的情况，所以也经常用形式主语it来代替，而把主语从句放到句末去。此时，连接词除了用whether外，也可以用if。如上面的句子就可以改为：
It remains to be seen if/whether it will do good to us.
再比如：
Whether the band would visit our city was still a mystery. （这个乐队是否会来我们城市仍然是个谜。）
上面的句子可以改为：
It was still a mystery if/whether the band would visity our city.
五、连接代词引导的主语从句
常用来连接主语从句的连接代词有：who、whom、whose、which、whoever、whomever、whichever等。这些连接代词在从句中有的作主语，有的作宾语，有的作定语。如：
作主语：Who won the game hasn''t been announced yet. （谁赢得了比赛，还没宣布。）作宾语：Whom you talked to just now will be confirmed later. （你刚才跟谁说话了，之后会证实的。）
作定语：Whichever nation explodes an atomic bomb will engage the whole world in war. （无论哪个国家使用原子弹都会使全世界卷入战争。）
为了避免头重脚轻，这种情况下的主语从句也经常用形式主语it来代替，而把主语从句放到句末。但是，连接代词始终都不能省略。如上面的两句话可以改为：
It hasn''t been announced yet who won the game.It will be confirmed later whom you talked to just now.
It will engage the whole world in war whichever nation explodes an atomic bomb.
六、连接副词引导的主语从句
能够用来连接主语从句的连接副词主要有：when、where、why、how等。这些连接副词在主语从句中作状语。如：
When they will arrive at the station doesn''t matter. （他们何时到站没有什么关系。）How the accident happended is still unknown. （这场事故是怎么发生的，还不清楚。）
Why he was absent from the meeting remains a mystery. （他为什么没有参加会议仍然是个谜。）Where I will spend my summer is none of your business. （我在哪里过暑假不关你的事。）
为了避免头重脚轻，上面的句子可以改为：
It doesn''t matter when they will arrive at the station.It is still unknown how the accident happended.It remains a mystery why he was absent from the meeting.It is none of your business where I will spend my summer.
七、what引导的主语从句
与that不同的是，what除了可以引导主语从句起连接作用外，还同时在从句中充当主语或宾语。如：
作主语：What really matters is that she needs a shower at once. （真正重要的是，她得马上冲个澡。）
作宾语：What I am worried about is their taking my son to France. （我担心的是他们要把我儿子带到法国去。）
有的时候，whatever也可以用来连接主语从句。如：
Whatever you do makes no difference to me. （你做什么对我来说都没区别。）
需要注意的是，当what或whatever引导主语从句时，一般不能改为由形式主语it来引导的句子。

主语从句的定义：主语从句是指在复合句中充当主语的句子，它是名词的拓展，属于主语的第三个表达层次。所以，主语从句和名词一样通常是出现在谓语动词的前面。
例句1：Whether he will pass the examination is still unknown.他是否能够通过考试仍然不知道。
例句2：What he said inspired me a lot.他说的话让我受到了很大的鼓舞。
主语从句的引导词：主语从句的引导词与宾语从句，表语从句和同位语从句的引导词几乎相同（表语从句有几个特殊引导词除外）请参照本站文章表语从句的用法讲解。以下就按照引导词在主语从句中的意义和功能分别讲解。
that引导主语从句
例句1：That youth is wholly experimental is known to us all。 众所周知，青春就是探索的岁月。
例句2：That she finished reading an English novel surprised us all.她读完了一部全英文小说让我们大吃一惊。
Whether引导主语从句
例句1：Whether she will come to the party makes no difference.她来不来参加聚会都没有关系。
例句2：It makes no difference whether/if she will come to the party.她来不来参加聚会都没有关系。
Who, what, which引导主语从句
例句1：Who will be the leader of the team has not been decided yet. 谁会成为这个队的领头人还没定下来。
例句2：What the kids need is a peaceful growing environment. 孩子们需要的是一个和平的生长环境。
whose, what, which引导主语从句
例句1：Whose face will flush is the liar. 谁的脸红了谁就是骗子。
例句2：What goal you set now determines what your will gain in the future.你现在设立什么目标决定了你将来会有什么收获。

when, where, how, why引导主语从句
例句1：Why Tony did this remained a mystery. 为什么托尼做这件事仍然是个谜。
例句2：When we will have our winter holidays is still uncertain.我们什么时候放寒假还不确定。
Wh-ever连接词引导主语从句
例句1：Whoever has a strong will is likely to become successful.凡是有坚强意志的人都有可能成功。
例句2：Whatever is worth doing at all is wroth doing well.凡是值得做的事情就值得做好。

主语从句的定义：主语从句是指在复合句中充当主语的句子，它是名词的拓展，属于主语的第三个表达层次。所以，主语从句和名词一样通常是出现在谓语动词的前面。
例句1：Whether he will pass the examination is still unknown.他是否能够通过考试仍然不知道。
例句2：What he said inspired me a lot.他说的话让我受到了很大的鼓舞。
主语从句的引导词：主语从句的引导词与宾语从句，表语从句和同位语从句的引导词几乎相同（表语从句有几个特殊引导词除外）请参照本站文章表语从句的用法讲解。以下就按照引导词在主语从句中的意义和功能分别讲解。
that引导主语从句
例句1：That youth is wholly experimental is known to us all。 众所周知，青春就是探索的岁月。
例句2：That she finished reading an English novel surprised us all.她读完了一部全英文小说让我们大吃一惊。
Whether引导主语从句
例句1：Whether she will come to the party makes no difference.她来不来参加聚会都没有关系。
例句2：It makes no difference whether/if she will come to the party.她来不来参加聚会都没有关系。
Who, what, which引导主语从句
例句1：Who will be the leader of the team has not been decided yet. 谁会成为这个队的领头人还没定下来。
例句2：What the kids need is a peaceful growing environment. 孩子们需要的是一个和平的生长环境。
whose, what, which引导主语从句
例句1：Whose face will flush is the liar. 谁的脸红了谁就是骗子。
例句2：What goal you set now determines what your will gain in the future.你现在设立什么目标决定了你将来会有什么收获。
when, where, how, why引导主语从句
例句1：Why Tony did this remained a mystery. 为什么托尼做这件事仍然是个谜。
例句2：When we will have our winter holidays is still uncertain.我们什么时候放寒假还不确定。
Wh-ever连接词引导主语从句
例句1：Whoever has a strong will is likely to become successful.凡是有坚强意志的人都有可能成功。
例句2：Whatever is worth doing at all is wroth doing well.凡是值得做的事情就值得做好。

主语从句，即在复合句中充当主语成分的句子，例如"That he finished writing the composition in such a short time surprised us all"，他在很短的时间内写完作文让我们都很惊讶，此复合句主要描述的是某事让我们惊讶，某事就是该复合句的主语，因此“That he finished writing the composition in such a short time”便是该复合句的主语从句。

拓展资料

主语：是执行 句子的行为或动作的主体，如“我写字”中的“我”，就是主语，它做出“写”这个动作。“写”则是 谓语，用来修饰主语，而“字”是接受谓语“写”这个动作的对象，它因此被称为 宾语，有的语法书也称它为“ 客体”或“ 受体”。