Ex.1 Fill in: can, can’t, could, couldn’t, was/wasn’t able to or had been able to.
1 He ________________ run much faster when he was younger.
2 On entering the house, she____________smell something burning in the kitchen.
3 I’m busy today, so I________________go shopping with you.
4 I heard Brian’s voice, but I_____________see him until I turned on the lights.
5 When I lived on the coast, I______________swim in the sea every day.
6 If Gordon ______________________avoid the rush hour traffic, he would have arrived at the party on time.
7 I’m not usually very good at tennis, but yesterday I_____________beat my brother in a match.
8 I had my hands full, so I___________________open the door.
9 Angela is very clever. She_________________speak four languages.