This is my father ,Miss Li和Miss Li ,thie is my father的区别

This is my father ,Miss Li和Miss Li ,this is my father没有区别,只是语序上的变化.
但是要区分This is my father ,Mr Li.这是我的爸爸（叫） 李先生
Mr Li,this is my father.李先生（是向李先生介绍我的爸爸）,这是我的爸爸.