Suppose you are Li Hua, your father called you and said your mother is now in hospital. Write a short note to your English teacher Professor Zhang in about 100 words and tell him you have to ask for two days’ leave and can’t attend his class this afternoon and you’ll make up the missed class right after you come back.
Do not sign your own name at the end of your letter; use Li Hua instead. You do not need to write the address.