In Engpsh, you can say "The teacher is cleaning the room" or "The teacher is doing the cleaning" to describe a teacher cleaning a room. "Clean" is a verb that means to make something free of dirt, germs, or other substances, while "room" is a noun that refers to a space enclosed within walls and a roof, typically used for pving or working in. Here are some example sentences that use these words:
"The teacher is sweeping the floor and dusting the shelves to clean the room."
"The teacher is wearing gloves and a mask to protect herself while cleaning the room."
"The teacher is asking the students to help her clean the room by picking up their belongings and putting them away."
"The teacher is using cleaning supppes, such as a mop and a bucket of water, to clean the room."
"The teacher is making sure to clean every corner of the room to make it sparkle and smell fresh."