求英语作文病假条内容是请假的原因,时间,请求老师的准许简单点就行

Hello. Mr Brown,I am sorry that I can't take the listening class on December20th. Because I have something urrgent to deal with. My uncle hasto deal with something about his business but he can't find a proper interpreter so he hopes that I can be his interpreter on that day. I would like you to give me a day off .I would appreciate it if you can consider my condition.
Yours,
Lihua