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5. If you don't ride carefully, you'll cause an accident.
6. If you dissolve 2 spoons of powder coffee and sugar in hot water, you'l have a cup of coffee to drink.
7. If you drive too fast, you will endanger yourself.
8. If it is overcrowded at this time, the epidemic will spread.
9. If Ba practices English with native speakers, he will improve his speaking skill. 
10. If you don't have a passport, you can't go abroad.
11. If children use smart phones too much, they will harm their eyes.
12. If the girl didn't tell lies, a lot of people wouldn't be infected with the Covid 19 Virus.
13. If Mr.Ba didn't drink a lot of beer before driving, he wouldn't be fined heavily.
14. If the man had money, he could buy something to eat.

15. If the girl were old enough, she could see this movie.
16. If Long were tall enough, he could join the school volleyball team.
17. If there were no air, there would be no life on our planet.
18. If there were no the invention of those machines, we couldn't live as we do now.
19. If Lam weren't mean with money, he would have many friends.
20. If the girl didn't stay up late, she wouldn't feel tired.
21. If you weren't too old, you could wear this dress.
22. If he runs every day, he will be healthy.
23. If it didn't rain heavily, they wouldn't cancel the match.

24. If Tuan weren't careless, he wouldn't break the vase.
25. If she weren't ill, she would go to school.