英语语法问题He is one friend of my father's.和He is one friend of m

he is a good friend of of my father's He is a friend of my father正确还是He is a friend of my father's He is a friend of my brother's.和He is a friend of my brother He is one of my friends.（改为同义句） He is a friend（ ）（ ） He is an old friend of my father.哪里有错? this is a friend of my father's 可以将a改成one吗? Jim is one of my father's friend 的同义句 He is one of ___(good) ____(friend) He is a friend of Tom's father Jack is _____old friend of my father’s and he is _____ headm 请问he is one of my father's friends为什么要加ONE he is one of my good friend的语病在哪,并改错