写一封e-mail告诉钢琴老师你不能去上钢琴课 提示词：1、last Sunday2、fell off my bicyc

To: piano teacher
From:（你的名字）
Date: 日期
Last Sunday, I fell off the bike, and damage to the teeth, and then my father took me to see the dentist. I hope the rest for one afternoon, so we can not go to class, please approve!
Date
Who
自己先用中文写,在翻译就OK 以上是简略的,你可以再加点