3.6 雙重所有格
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   物主代詞不可與 a, an, this, that, these, those, some, any, several, no, each, every, such, another, which等詞一起前置,修飾一個(gè)名詞,而必須用雙重所有格。
 公式為:
  a, an, this, that +名詞+of +名詞性物主代詞。如:
    a friend of mine.
    each brother of his.