参考答案一：
While He Yan was at the doctor's. I was going to the class. While He Yan was having English class, I was having a test. While she was having lunch with her mother, I was playing in the park. While she visiting her aunt in hospital, I was studying in the classroom. While she was going shopping, I was going home.
参考答案二：
While He Yan was at the doctor's,I was going to the class. While He Yan was having English class,I was going shopping.While He Yan was having lunch with her mother.I was having a lunch with my friends.While He Yan was visiting aunt in hospital.I was reading books at home.While He Yan was going shopping.I was watching TV with my parents.
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