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 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.