some stuff表示单数还是复数?

问题描述:

some stuff表示单数还是复数?
比如 The couple are at odds over some private stuff(s).应该用Stuff还是stuffs?
stuff的复数形式是stuffs么?能否举个例句stuff用作复数形式?

stuff不可数,没有复数形式.
private stuff
All my stuff is in boxes.
Where did he put his stuff?