3.6 双重所有格
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。
a friend of mine.
each brother of his.