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 英语翻译a friend of my father's还是a friend of my father,如何辨别, “A friend of my sister”表达正确吗?还是应该是“A friend of my sister's”? 是a friend of my mother对,还是a friend of my mother's对? 是A pen my friend gave to me 还是 A pen my friend given to me a friend of Tom表达对,还是a friend of Tom's对a friend of my father对，还是a friend of my father's对 改错 My friend is a ture friend 是a firend of my english teacher 还是 a friend of my english teacher's 为什么 She is a friend of my正确还是She is a friend of mine正确? best a friend还是a best friend?为什么?还有,my best friends friend可以加s吗?为什么? he was___in the childhood.填写my close friend还是a close friend of mine? 英语翻译a letter from my friend a friend of mine=?my friends my friend ( )cartoon.A.like B.likes my friend have a nice bedroom.改错 they are a( ) my best friend a litter form my friend 中文怎么说