请问behind 和 from behind 有什么区别?

问题描述:

请问behind 和 from behind 有什么区别?
如上

behind 可以是副词 介词 名词
多表示在后面,名词是屁股【非正式用语】
We walked behind.adv.
He sat behind her.prep.
from behind
从...后面 介词词性
He runs form behind me.