a my friend还是my a friend ,为什么

a my friend还是my a friend ,为什么 a friend of my还是a friend of mine a friend of mine= my friend 改错 My friend is a ture friend 是A pen my friend gave to me 还是 A pen my friend given to me 英语翻译a friend of my father's还是a friend of my father,如何辨别, 是a friend of my mother对,还是a friend of my mother's对? a letter to my friend a friend of my brother She is a friend of my正确还是She is a friend of mine正确? 改错Peter is a friend of my father.为什么? My friend suggests my getting a job in a bank.此句为什么是my getti