什么是主语从句？举例说明一下并在例子中详细说明！

什么是主语从句？举例说明一下并在例子中详细说明！

主语是个句子。That the earth is round is true.

顾名思义就是主语是一句有引导词的句子 What he wants is a book. How he was successful is still a puzzle. Why he has come to New York is a story of struggle and success. 多数情况由it作形式主语，而把主语从句放在主语之后。例如： It is reported that no one was killed in the earthquake. 据报道地震中没有人死亡。

主语从句就是从句在句子中充当主语

例：That she was chosen made us very happy.

made 是谓语动词，所以made 前面的是主语部分，而主语部分是一个句子，所以是主语从句

主语从句是名词性从句的一种，主语从句在整个主句中作主语，叫主语从句。What he said is right.

 

1）主语从句可直接位于主语的位置，如果从句较长，谓语又较短，可用it作形式主语，而将从句放在句末。常见的句型有：

*It is a fact\a pity\a question\good news that...

*It seems\appears\happened\has turned out that...

*It is clear\important\likely\possible that...

*It is said\reported\estimated\has been proved that...

It is said that comic books create a connection between people of the same generation.

It seems that the performance is very useful.

2)what引导的主语从句表示“...的东西时”。

What we lack is experience.

3)what,who,when,why,whether等词含有各自的疑问意义，但它们引导的主语从句，都用陈述语序。

How the plan is to be carried out should be discussed again.

I did know why I felt like crying.