for
used to show who is intended to have or use something or where something is intended to be put （表示对象、用途等）给,对,供
There's a letter for you.有你（的）一封信.
It's a book for children.这是本儿童（的）读物.
in order to help somebody/something 以帮助；为了
soldiers fighting for their country 为祖国出征（的)军人
而of是表从属关系的.
belonging to somebody; relating to somebody 属于（某人）；关于（某人）
a friend of mine 我（的）一个朋友
the love of a mother for her child 母亲对孩子（的）爱
the role of the teacher 教师（的）角色
Can't you throw out that old bike of Tommy's?难道你就不能把汤米那辆旧自行车给扔掉?
the paintings of Monet 莫奈的画作
belonging to something; being part of something; relating to something 属于（某物）；（某事）部份的；关于（某物） for
used to show who is intended to have or use something or where something is intended to be put （表示对象、用途等）给,对,供
There's a letter for you.有你（的）一封信.
It's a book for children.这是本儿童（的）读物.
in order to help somebody/something 以帮助；为了
soldiers fighting for their country 为祖国出征（的)军人
而of是表从属关系的.
belonging to somebody; relating to somebody 属于（某人）；关于（某人）
a friend of mine 我（的）一个朋友
the love of a mother for her child 母亲对孩子（的）爱
the role of the teacher 教师（的）角色
Can't you throw out that old bike of Tommy's?难道你就不能把汤米那辆旧自行车给扔掉?
the paintings of Monet 莫奈的画作
belonging to something; being part of something; relating to something 属于（某物）；（某事）部份的；关于（某物）