Mike: Bobby, is this you? 
Bobby: No, it isn't. 
Mike: Who's this man? 
Bobby: It's my father's friend Jim. 
Mike: He is very handsome. And is this your father?
Bobby: Yes, he is.
Mike: Your father looks strong. What's your father? 
Bobby: He's a doctor. He works in hospital. He goes to work by underground. And that is my mother. 
Mike: She looks very beautiful. What's your mother? 
Bobby: She's a teacher. She works in a school. She goes to school by bus. Mike, what's your father？ 
Mike: He's an engineer. He goes to work by taxi.