The reason for asking for leave is excusable.
First of all, your reasons for taking time off must be excusable, and you can't take time off to avoid studying.
There are many ways to ask for leave.
If there is a legitimate reason to ask for leave, you can ask the teacher for leave. The ways to ask for leave are: 1. Write it on a piece of paper. 2. Call the teacher. 4. Communication software such as WeChat QQ.
Vacation outline
The title is vacation. Say hello to the teacher first, say that you want to ask for leave and explain the reason, and finally sign your name and indicate "please sign after approval"