No, you don't, right? You say: "Look, when you don't understand, you put your hand  up in the air and ask the teacher until you are cleared."
이렇게 말하지 않죠? 여러분은 이렇게 말하겠죠 "만약 질문이 있으면, 손 들고 선생님한테 물어봐, 확실히 알 때 까지."