1. had 2. do, meets 3. Did his brother come yesterday?, did not 4. Do you get up...?, slept 5. How many lessons do you have...? 6. Do...? 7. didn't understand 8. How often do you go to...?, go 9. sleeps, slept 10. walk, took 11. Did she bought...?, didn't 12. Did they sell...?, don't know 13. is, ate 14. When did you leave...? 15. Are...?