题目内容：

It is a pity that?(原句是：What a pity it is that you didn"t arrive by day )
It is a pity that?(原句是：What a pity it is that you didn"t arrive by day 中的that you didn"t arrive by day 是that 引导的主语从句吗?

优质解答

it是形式主语,that从句是真正的主语

追问：

那that引导的是主语从句吗？？

追答：

是的，为了防止句子头重脚轻，通常把形式主语it放在句首位置，真正主语搁置于句末