(can, may, must) you play the piano? 2. (can, may, should) i watch tv before going to bed? 3. i am sure i (can, may, need) do the work myself. 4. mary (can, must) finish the work at once. 5. (have, may, can) you start working immediately? 6. i (can, am, may) to come to the examination at 9 o’clock. 7. (must, can, may) i trouble you for a glass of water? 8. he (have, has, must) to learn english. 9. you (must, can, may) follow my advice. there is no way out for you. 10. (am, must, may) i have a look at your painting? 11. (have, can, may) you play the piano? 12. you (can, may, must) stay a little longer if you like. 13. i (may, can, have) not hear you. speak louder. 14. you (have, must, can) return this book to the library. we all need it. 15. we (have, are, must) to meet each other at the station