Réponse:
7. If dave didn't know all the answers,he wouldn't have won.
8. If selena didn't lose her tickets,she could have gone to the concert.
9. if Malik's sales figures weren't disappointing,he would have gotten a promotion.
10. if we didn't have to queue up for tickets,we wouldn't have missed the start of the show.
11. If Malcolm would have gotten good marks in his exams,he would be at the University now.
12. If my parents were rich,the would have bought me expensive presents.