The audio recording provides students with an opportunity to hear doctor-patient conversations. It also is an opportunity to discuss imperative sentences like "Take this twice daily." I taught my students about adverbs of frequency and expressions of frequency. They learned the meanings of "twice a day", "once a month", "three times daily' and many more. The audio recording can be used to make different kinds of activities, depending on the needs of your students and what you as the teacher want to focus on.