be across from 主语可以是人么

问题描述:

be across from 主语可以是人么
I am across from the bank
The post office is across from the bank
be across from.
前面的主语,是人,是 物,都可以吗.
第一句 不确定是否可以这么说

可以是人,比如 翻译:我就在你对面.
i am just cross from you.