Sam: Hi, David, let’s go swimming.
David: Oh, we swam last week.
Sam: We should do physical exercises every day.
David: How often do you swim?
Sam: Twice a week. And I jog everyday. What about you? How often do you go to do some sports?
David: En… maybe once a month.
Sam: It’s unhealthy. Let’s go. Sports is good for your health.
David: Ok.