Can ,can't, could, couldn't, how many ,must, should, 1 You__ turn off mobile phones in exams. It's one of the rules! 2__ you swim when you were four?' "No, I__. I learned when I was six. 3 __languages__ your parents speak?' "Only English. They __speak any other languages. 4 "Have you got any advice? "Yes, you __tell your teacher.