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主语从句就是在句中作主语，主语从句的位置与陈述句中主语位置相同的，统观主语从句的考核占有相当比重，下面和小编具体来看一下that引导的主语从句吧！ 1.that在句中不做成分。当主语从句位于句首时，不能省略：
That he likes books of this kind is very interesting.= It’s very interesting (that)he likes books of this kind.
这是用的最多的一种主语从句,但把这种主语从句放在句首是很少的,只是为了强调或谓语较长时才这样安排.例如：
That prices will go up is certain.
That she is still alive is a consolation. 2.当谓语动词是seem,appear,be a pity.be a wonder,be likely等时，使用形式主语It，而将真正的主语放在句尾，这时从属连词that可省略：It appeared to scientists on earth (that) the stars had moved.
还有一些例如：绝大部分主语从句都借助先行主语放到句子后部去. a.It +be + 形容词+that从句：
It is natural that they should have different views.
It was quite obvious that she didn’t want to come. b.It +be + 名词 +that 从句：
It’s a shame that you’re sick.
It’s a pity that he can’t swim. c.It + 动词（+ 宾语或状语）+ that 从句：
It happened that she wasn’t in that day.
It seems that you’re right. d.It + 动词的被动语态 + that 从句：
It’s said that there has been an earthquake in India.
It’s reported that the enemy troops have crossed the border. | 
