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6. If I don't make the mistake again, she won't shout at me
7. If she isn't good at English, she won't become a tourist guide
8. If Mr. Hoa has free time, he will come here
9. If you press this button, the machine will start
10. If I stop smoking, I will have a better health
11. If I know your address, I can visit you
12. If we stop destroying forests, we will have clean air