Dưới đây là các câu đã được viết lại mà không làm thay đổi nghĩa:

17. **I can't eat fish because I have an allergy to them.**
If I could eat them, I wouldn't have an allergy.

18. **Should you be busy, I’ll take care of that.**
If you are busy, I’ll handle it.

19. **Were we to have more money, we could buy this house.**
If we had more money, we could purchase this house.