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14. If you don't leave me alone, I'll call the police.
15. Should you arrive at the office earlier than I do, please turn on the air - conditioner.
16. Had he not died so young, he would be a famous musician by now.
17. Were you to take good care of the car, it wouldn't break down so often.
18. If you tell lies to your boss, you'll be fired at once.
19. Had he revised all his lessons, he wouldn't have failed the exam.
