If you were a dance teacher and were giving dance lessons to children, and a parent called in the classroom, what would you do?

Friendly reminders such as "In order for children to concentrate on their studies, please do not make phone calls in the classroom during class hours" can be posted in a conspicuous place in the classroom;

If there are still people on class time When making a phone call in the classroom, you can stop the lecture and give him or her a look with a smile. Of course, everyone will give him or her a collective look at this time; Then he pointed to the prompt on the wall and made a polite gesture to please come out.