Bill: Hi, Mary! How are you? 
Mary: Hi, Bill! I'm fine. How are you? 
Bill: I'm great! You looks so slim. Do you like doing exercises?
Mary: Yes, I like it very much. 
Bill: So what is your favorite sport? 
Mary: Playing tennis, I think. 
Bill: How long have you played tennis? 
Mary: Since I was six years old. 
Bill: So you have played tennis for 3 years, right? 
Mary: You're right. 
Bill: How often do you play tennis? 
Mary: Once a week. Would you like to play tennis with me this weekend? 
Bill: I'd love to.