This is a short summary of the dialogue (ex.21). Write it down referring to the past.

A patient comes to see the doctor. He is coughing badly. The doctor says he doesn't like the patient's cough and asks him to take off his shirt. He wants to know how long the patient has had his cough. The doctor asks if the patient takes much exercise. The patient says that he doesn't do it regularly and explains that he hasn't come about his cough. He says his feet hurt every time he walks. He has had this pain for 2 weeks. Then he understands that he has had new shoes for 2 weeks too.