Question

it+be+名词/形容词/过去分词+that从句是什么意思？是固定搭配吗？

Answer 1

意思是“...是...的”。

追答

算是一个固定句型。

其中，it 是形式主语，而后面的 that从句才是主句的真正主语(此时that从句为主语从句)。

比如：
It is a pity that you didn't come here yesterday.
你昨天没来这里，真是有点遗憾。

It's important that you should work hard.
你应该努力工作，这一点很重要。

It's said that he has died.
据说他已经死了。