какую работу выполняет буква У в слове утюг

начальная  форма  частей  речи

1. If the food (be) good, we’ll come here again. 2. What will you do if Ann (not pay)? 3. When I arrive, I (phone) you. 4. You (help) me if I have а problem? 5. Before you (go), leave my key on the table. 6. If you (not pay), you’ll get into trouble. 7. As soon as Linda (arrive), call me. 8. What you (say) if Peter asks? 9. If you don’t go away, I (call) the police! 10. I (not wait) if he is late again. 11. If he (miss) the last train, he’ll spend the night in а hotel. 12. What will you do if the weather (be) bad on holiday? 13. If I stay here, I (not be) happy. 14. If I (be) unhappy, I won’t work hard. 15. She’ll have some German lessons before she (go) to Berlin. 16. If Peter (ring), tell him I will never see him again. 17. He (be) happy if he wins his next match. 18. She won’t be able to go until she (feel) much better. 19. If the bus (not come) soon, I’ll be late for school. 20. I want to speak to him before he (go) out.