Whenever he buys something, whether it be drinks or snacks ,he remembers to share with his buddies.
这句话也可以改为be it结构的倒装让步状语从句，
Whenever he buys something,be it drinks or snacks ,he remembers to share with his buddies.
我在语法书中看到的内容说，这里的be也是一种虚拟的形式。
这点我有些不理解？
