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.