Please don't be late for class, or the teacher will be unhappy.

上课请不要迟到，否则老师会不高兴的。

Don't be late for class again.

上课不要再迟到。

Don't be late for class again.

不要再次上课迟到。

Don't be late for class, please.

请不要上课迟到。

Don't be late for class next time.

下次上课不要再迟到了。

Please don't be late for class again.

上课请不要再迟到。

Second, when you have classes, you can't wear a hat. Third, don't be late for class. It is not good. Fourth, after class, you can't run or play in the classroom or the hallways.

第二，当你上课时，不能戴帽子，第三，上课不能迟到，这是不好的，第四，下课后，不能在课室里或在走廊里玩，这是非常危险的。

Don't arrive late for class. You must be on time.

上课不要迟到。你必须准时上课。

You'll be late for the class if you don't hurry.

如果你不快点，上课就会迟到。

I also know that, for each class, the students in class, don't leave early on, don't be late is one of the most basic responsibility, also is the most basic duty.

我也知道，对于学生，保证每堂课按时上课，不早退，不迟到是一项最基本的责任，也是最基本的义务。