主语从句一般有三种结构：

1. 主语从句+谓语

That she will win the match is certain.

2.主语从句+形容词（名词词组、过去分词）+that从句

It is important that we teens should learn English.

It is a good news that he will attend the meeting on behalf of our school.

It is said that our school will hold a sports meeting

3. It +seem (happen，appear等不及物动词)+that从句

It seems that Katy is not coming to this party.