Jól oldottam meg a feladatot?

Complete the sentences using could, couldn't, or was/were able to.

My grandfather was a very clever man. He could speak five languages.

I looked everywhere for the book but I couldn't find it.

They didn't want to come with us at first but we were able to persuade them.

Laura had hurt her leg and couldn't walk very well.

Sue wasn't at home when I phoned but I was able to contact her at her office.

I looked very carefully and I could see a figure in the distance.

I wanted to buy some tomatoes. The first shop I went to didn't have any but I was able to get some in the next shop.

My grandmother loved music. She could play the piano very well.

A girl fell into the river but fortunately we were able to rescue her.

I had forgotten to bring my camera so I couldn't take any photographs.

ja és még egy kérdés: úgy lehet tagadni, h pl: wasn't able to v. weren't able to ???