从句在前的主语从句例句（几个例句让你理解主语从句）

名词作主语、宾语、表语、同位语转化为从句，顾名思义，当一个句子作主语时就是主语从句

1. That she is still alive is a wonder.

That 引导主语从句起连接作用，不作成分，无词义，不可省。

2. What you said yesterday is right.

What 引导主语从句在句子中作主语、宾语、表语，意为"所谓的""什么东西".

3. Whether you go or not is up to you .

Whether 只起连接作用，不充当成分，有是否之意，只有在宾语从句中才能用if.

4. Who will attend the meeting hasn't been decided.

Who 引导主语从句时在句中作主语、宾语或表语。

5. Whose book it is unknown yet.

Whose 在主语从句中作定语。

6. when he will go to Shanghai is unknown to us.

连接副词how, when, where, why 引导主语从句，分别作方式、时间、地点和原因状语。