Dear (男/女老师名),
Dear Mr/Mrs _____
I am writing to make you aware that my child, (你的名字)class (班级) will be absent from (开始日期___ to 完成日期___)due to his/her sickness.
If you have any queries please contact me on 电邮/电话________
Sincerely,
你父母的签名______
希望对你有帮助,如觉的有用,请采纳