【答案解析】Dear Smith,
I am sorry to tell you that I can"t attend your class next Tuesday. I work for a trade company, and my company manager has decided to send me away on a three-day business trip to Hainan from Monday to Wednesday. So I will miss your class on Tuesday. I wonder if you can do me a favor to record your class so that I can listen to it later. I would be very grateful to you, and I am sorry for the inconvenience that I have caused to you.
My best wishes to you!
Yours,
Li Ming
[解析] 这是一篇请假条，首先要交代请假的原因。其次要这类问题的语言，文中要表达出歉意。有哪些需要补充的信息和要求也可以一并说明。