1. If he had trained enough last year, he would be a first-class sportsman now.
2. If the pupils had been attentive, they would have understood the homework.
3. If he hadn't been at the dress rehersal, he would go to see the play.
4. If we had been thirsty, we would have gone to the cafeteria.
5. If she were good at foreign languages, she would try to enter the foreign languages department.
6. If he had gone to the dentist, he wouldn't be groaning with pain now.