What's this?
Open your book.
What's this?
Raise your hand.
What's this?
Stand up.
What's this?
Put your things in your bag.
What's this?
Sit down.
What's this?
Let's clean up.
What's this?
Be quiet.
What's this?
Come to the board.
What's this?
May I go to the bathroom, please?
What's this?
Close your book.