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如何判断主语从句中的主句部分和从句部分?
判断主句和从句，关键看谁做谁的一个句子成份。从句相对于主句而言，即它是从属于某一个主句，而不能单独作一个句子。
在英语中，主要有三大从句，即名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）、形容词性从句（即定语从句）、副词性从句（即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等）。
从句句子的某一个成分是由一个句子来表示的，这个句子就是从句。如：
I saw him when I was walking home.
当我回家时我看见了他。
当我回家时做我看见他的时间，所以when…是从句，I saw him是主句。
I said that I knew it.
是说的内容，做宾语，叫宾语从句。I said就是主句。
扩展资料
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。
（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。
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。）
参考资料来源：百度百科-主语从句
主语从句的句型结构
第一个从句在动词was后，所以从句作谓语；
第一个从句作主语，是will
make
a
mistake的主语
有不懂的还可以问。(*^__^*)
嘻嘻……
主语从句有哪些类型
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。
主语从句的结构
除if外，所有引导宾语从句的关联词都能用来引导主语从句
Who
will
go
is
still
unknown.谁去还不知道
What
we
need
is
more
time,我们需要的是更多的时间
主语从句放在句首，句子显得头重脚轻，故通常把它移到句子后面，前面用引导词it来做它的形式主语
It's
not
yet
known
where
she
has
gone.还不知道她到哪去了
It's
a
pity
that
she
has
made
such
a
mistake.很遗憾，她犯了这样一个错误
祝你进步，望采纳
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