12. If she didn't travel by plane, she wouldn't be on time for the meeting.

13. If he didn't speak fast, they would understand him.

14. If we plant more tree, the air will be fresher.

15. If we use fewer cars, we will reduce pollution.

16. If we cycle to school every day, we will keep fitter.

17. If we use recycled products, we will save money.

18.If the boy didn't eat so many green apples, we wouldn't be ill.

19. If we use reusable 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.

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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