The School Cleaner

It happened in my Adannced Level class, in grade 12. Cleaning the class room before starting school at 7.30 a. m. was one of the main duties of students to be fulfilled as groups. This was our day of cleaning.
This day, we were not able to clean our class room on time, because all members of our group were late. While we were starting to do cleaning, our class teacher came to start the Logic lesson in first period. After seeing the untidiness of the class, he was got very upset and angry. He looked at us and shouted. For the purpose of giving punishment to us, he took the broom and cleaned the room by himself. We were not allowed to do any cleaning.
He wanted us to see "how cleaning is done."
KAMANI