物主代词不可与 a, an, this, that, these, those, some, any, several, no, each, every, such, another, which等词一起前置，修饰一个名词，而必须用双重所有格。

　　公式为：

　　a, an, this, that +名词+of +名词性物主代词。如：

　　a friend of mine.

　　each brother of his.