```
Dear [老师的名字],
I am writing to inform you that I have to ask for [请假天数] leave due to [请假原因]。 I have been feeling unwell with [具体症状，例如：a bad cold, a fever]，which makes it difficult for me to concentrate on my studies.
I have already seen a doctor, and they have recommended me to rest for a few days to recover. Therefore, I would be grateful if you could excuse me from classes from [开始日期] to [结束日期].
I will make sure to catch up on the missed lessons and complete any assignments before the next class. If there are any assignments due during my absence, I will submit them as soon as I return.
Thank you for your understanding and support.
Sincerely,
[你的名字]
```
请根据实际情况修改上述模板中的方括号内容，以确保请假条符合你的具体需求。例如，你可以填写老师的名字、请假的天数、具体的请假原因、开始和结束日期、医生建议的休息时间，以及你计划如何补上错过的课程。