----- Nội dung dịch tự động từ ảnh ----- 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.