Betty and Bob are talking on the telephone.
Betty: Hi, Bob. What are you doing?
Bob : I'm watching TV. How about you?
Betty: I'm doing my homework.
Bob : You are a good student, Betty.
你在做什么?
贝蒂和鲍勃在讲电话。
贝蒂：嗨，鲍勃。你在做什么?
鲍勃：我在看电视。你呢?
贝蒂：我在做功课。
鲍勃：贝蒂，你是个好学生。