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16. You could contact / can contact people everywhere at any time if you
had a mobile phone.
17. If the machine stops, will press/press that red button to start it again.
18. You can smoke in here unless / as long as you leave a window open to
let the smoke out.
19. If you had come earlier, you wouldn't miss / wouldn't have missed the
party.
20. Howard will buy a car providing he gets / he doesn't get his driving license.
21. Had it not been / Were it for his help, I would have lost my bike.
22. If we took / take the plane, we could save time.
23. A businessman won't succeed unless / in case he works hard.
24. If he had been/were careful, he wouldn't have fallen down the stairs.
25. If she spoke / had spoken Spanish, she would have got the job.