Fill the spaces with could or was able. In some of the following sentences either variants could be used. In others only was/were able is possible. Put “to” where necessary before the infinitives.
1) He was very strong; he ski all day and dance all night.
2) The car plunged into the river. The driver get out but the passengers were drowned.
3) I was a long way from the stage. I see all right but I hear very well. (2nd verb negative)
4) We borrow umbrellas; so we didn't get wet.
5) you walk or did they have to carry you?
6) I had no key so I lock the door. (negative)
7) I knew the town so I advise him where to go.
8) When the garage had repaired our car we continue our journey.
9) At five years old he read quite well.
10) When I arrived everyone was asleep. Fortunately I wake my sister and she let me in.
11) The swimmer was very tired but he reach the shore before he collapsed.
12) The police were suspicious at first but I convince them that we were innocent.