It is very interesting to speculate what one could do after leaving the school 请帮忙分析这句话的语
问题描述：
It is very interesting to speculate what one could do after leaving the school 请帮忙分析这句话的语
答
It 是形式主语,真正的主语是to speculate what one could do after leaving the school
而在后者中speculate 后面的又是宾语从句,
去猜测一个人毕业后能做什么很有趣