给的信息太少。
Dear Mr XX，或者Dear Miss XX，（男老师用前者，女老师用后者，XX表示他的姓）
Because I got a bad cold yesterday evening and I can‘t go to school today. I felt even worse this morning.The doctor asked me to stay in bed for two days. Thus, I am writing to ask you for two days' sick leave.thank you for your understanding.
yours，
你的名字
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