19. If my father led me the car, I could take you.
20. If you were free tonight, you could go out with us.
21. If he saved enough money, he would buy a car.
22. If I were 5 years younger, I would do morning exercise.
Cấu trúc câu điều kiện loại 2:
If + S + V(d/ed), S + would/could/might + V(inf)