Practice the conversation. Swap roles and repeat. (Thực hành bài hội thoại. Đổi vai và lặp lại.) Bill: We can take the train or the subway. Lucy: How much is the subway? Bill: It's nine dollars. How much is the train? Lucy: It's sixteen dollars. The subway isn't as expensive as the train. Bill: Yes, but the train has bigger chairs. It's more comfortable than the subway. Lucy: Let's take the train. Bill: OK.