12. If she travels by plane , she will be on time for the meeting .
13. If he speaks fast , they won't understand him.
14. If we plant more trees , the air will be fresher .
15. If we use fewer cars , we will reduce popullation.
16. If we cycle to school every day , we will keep fitter .
17. If we use recycled prducts , we will save money .
18. If the boy eats so many green apples , he will be ill.
19. If we use reuseable bags for shopping , we will reduce waste .
20. If she doesn't hurry , she will be late for school .
21. If you don't water the plants , they will die .
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