below are extracts form the diary that he kept.中的below 为什么做主语
问题描述：
below are extracts form the diary that he kept.中的below 为什么做主语
答
below非主语.
本句系倒装句,成分为：below表语 are 系动词extracts form the diary that he kept主语,其中that he kept为the diary的定语从句.