Not being late is the disciplinary requirement of college students' code of conduct. If you are late, you need to apologize to the teacher and explain why you are late. You can only sit in class with the permission of the teacher, otherwise you can't.

If you meet a strict teacher, you may criticize or deduct points, and you should admit your mistakes in time. If the teacher has called the roll, you should communicate with the teacher in time after class, otherwise it will be easily regarded as truancy, so you'd better observe the classroom discipline and not be late.