1. If you (not study), you (fail) the test. - If you do not study, you will fail the test.
2. If you (have) enough money, I will (buy) you a present. - If you have enough money, I will buy you a present.
3. When you (run) fast, you get tired. - When you run fast, you get tired.
4. If you go to the party, I'm sure you (have) a good time. - If you go to the party, I'm sure you will have a good time.
5. If we buy a car, we (not have to) travel by train. - If we buy a car, we will not have to travel by train.
6. If you (cook) dinner, I'll wash the dishes. - If you cook dinner, I'll wash the dishes.
7. If I have a party, I will (invite) all my friends. - If I have a party, I will invite all my friends.
8. If it (be) sunny tomorrow, we'll go to the park. - If it is sunny tomorrow, we'll go to the park.
9. Whenever it (rain), I take my umbrella. - Whenever it rains, I take my umbrella.
10. If you (not sleep) enough, you get tired. - If you do not sleep enough, you get tired.