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4. Unless people water those flowers, they will die.

5. Unless he tells the truth, no one can help him.

6. If you don't keep your feet dry, you will catch a cold.

7. Unless I catch the plane, I will not be home by 5.

8. Unless you apologize, I will never speak to you again.

9. If he doesn't give me his number, I will not phone him.

10. Unless he learns his lessons carefully, he can't do that exercise.

4. Unless someone waters them, those flowers will die

5. Unless he tells the truth, no one can help him

6. If you don't keep your feet dry, you will catch a cold

7. Unless I catch the plane, I won't be ho,e by five

8. Unless you apologize, I will never speak to you again

9. If he doesn't give me his number, I won't phone him

10. Unless he learns his lesson carefully, he can not do that exercise