=>
4. If you are not careless, you'll not break the vase.
5. If he buys recycled products, he can do a part to save the environment.
6. If we put garbage into the bín, we will minimize pollution.
7. Unless flowers are watered enough, they won't bloom.
8. Unless you succeed, you will have to try it again.
9. She is a careful typist.
10. She is a good English teacher.
11. He doesn't speak English well.
12. She dances ballet excellently.

13. They are skillful soccer players.
14. She is too old to work hard.
15. Because of the boring story, I am sleeping now.
16. Because of the rain, I can't go out.
17. I was punished by the teacher because I forgot to do the exercises.
18. The weather was cold, so they had to cancel their picnic.

19. Because of being given a bike, Laura was very happy.
20. Because the silk dress cost too much, we didn't buy it.
21. Because of studying hard, they passed their TOEFL exam.

4. If you are careless, you will break the vase.

5. If he buys recycled products, he can do a part to save the environment.

6. If you put garbage into the bins, you can minimize pollution

7. Unless flowers have enough water, they won't bloom

8. Unless you succeed you will have to try it again

9. She is a careful typist.

10. She is a good English teacher.

11. He doesn't speak English well

12. She dances ballet excellently.

13. They are skillful soccer players.

14. She is too old to work hard.

15. Because of the story's boredom, I am sleeping now

16. Because of raining, I can't go out

17. I was punished for forgetting to do the exercises.

18. The weather was so cold that they had to cancel their picnic. 

19. Because of being given a new bike, Laura was very happy.

20. Because the silk dress cost too much, we didn't buy it.

21. Because of studying hard, they passed their TOEFL exams