It is a pity that he could not come .这句话是主语从句吗?请分析一下句子成分,

He could not come 这件事情是一个遗憾。It 是形式主语,真正的主语是that 引导的从句。这句话就等于：That he could not come is a pity。It is + 形容词 （for sb。) to do sth。to do sth 是真正的主语,it 只是形式主语。你说得很对!很棒!祝学习愉快!