Language focus 3 Complete the sentences with the words inthe box.cancan't could couldn'thow many must should1 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 otherlanguages.'4 'Have you got any advice?''Yes, you — tell your teacher.'​