what is known to us all is that the 2008 Olympic Games will take place in Beijing.是什么从句?
问题描述：
what is known to us all is that the 2008 Olympic Games will take place in Beijing.是什么从句?
是主语从句,还是表语从句,为什么?
答
what is known to us all 主语从句（作主语）
is（系动词）
that the 2008 Olympic Games will take place in Beijing表语从句（作表语）
两个都是从句，那么主句是什么啊？难道一个句子不需要主句吗？我已经说了呀what is known to us all是主语，因为它是个句子，所以叫主语从句那么主句是什么？the 2008 Olympic Games will take place in Beijing 2008年奥运会将在北京举行。