of these,是用all还是both?为什么?怎么区别?

of these,是用all还是both?为什么?怎么区别? 请问到底是all of these还是all these all ,all of,both,both of的区别 both of these counts 谓语动词用单数还是复数 both them还是both of them?为什么? all 和all of的区别,both和both of的区别 both的用法是说both these books both of these books说一下BOTH的用法 all of,all; both of,both他们分别有什么用法上的区别 both of which 与all of which的区别 both 和 all both of的用法区别还有关于both短语的用法 both 和all区别? both papers 和both these papers区别?