定语从句与主语从句
问题描述：
定语从句与主语从句
As is known to all paper was first made in China.和It is known to all that paper was made in China.老师说这两句可以看出定语从句和主语从句的区别
答
It is known to all that paper was made in China.此句中,it是形式主语
真正的主语是后面的that从句,即 paper was made in China.