Do students in the classroom during break time. If you do things in the classroom, teachers need to have control. And must request permission from the head of the class.
No students were in the classroom during the time. If the activity in the classroom, teachers must be controlled and must obtain permission from the head of the class.
Students do not stay in the classroom during the time when it would have to be a teacher in the classroom to do activities in control and need to get permission from the chief-level