6. I didn't eat breakfast several hours ago, so I am hungry now.
→ If I
7. If John play for our football team, we will not lose the game.
→ Unless
8. If I won a big prize in a lottery, I'd give up my job.
→ Unless
9. If you don't like this one, I'll bring you another.
→ Unless
10. I'll only help you if you promise to try harder.
Unless
11. If she doesn't work harder, she'll lose her job.
→ She'll
12. You must work harder or you won't pass the exam.
→ You won't