1. The cat will run away if he (leave) the door open.
2. If you join the choir, you (sing) well.
3. The museum will be closed if Tom (arrive) too late.
4. If we (leave) the sausages on the table, the dog will eat them.
5. If she (not / drink) enough, she will get a headache (Kopfschmerzen).
6. If you (not / buy) something for her birthday, Susi will be sad.
7. We (have) a BBQ if you buy sausages.
8. We will go by bike if the weather (be) nice.
9. If we (be) in London, we will visit The London Bridge and The Tower.
10. Her parents will buy her a pet if she (write) a good grade.
11. If you leave the window open, it (be) cold.
12. If Ananda (drive) too fast, she will have an accident (Unfall).
13. If she (not / feel) safe, I will join her.
14. If Grace can't repair her bike on her own, I (help) her.
15. I will drink tea if you (not / have got) coffee.
16. If you (eat) an apple a day, you will stay healthy.
17. If the postman (make) the dog angry, it will bite him.
18. If you leave the cage open, the parrot (fly) away.
19. If you turn on the heating (Heizung), it (be) hot in the classroom.
20. The teacher will give Pete an extra exercise if he (not / do) his homework.