it is high time that...是什么从句? it is a pity that...是什么从句?

题目

it is high time that...是什么从句? it is a pity that...是什么从句?
在网上查这两个句型,说“it is high time that...”是定语从句? “it is a pity that...”是主语从句?怎么区别的?“it is”和“that”之间不都是名词吗?

答案

It is high time that China resume its systematic reform. It is a pity that you made the mistake with yr job.
只要会用,根本不需要去分析是什么句型与从句名称!