Although the shop was very crowded, we could / were able to get the shopping done quite quickly.

I could buy / could have bought my tablet cheaper online, but I got it from my nearest independent computer shop instead because I like to support local businesses.

We were able to/could find our way around Rome easily by using online maps on our smartphones.

When I was a small child, I could / was able to sing beautifully, but my voice isn’t so good now.

I’ve searched everywhere for my car keys, but I can’t/couldn't find them anywhere.

I wasn’t able to/can't translate the text into French, because it contained too many unfamiliar expressions.

I was so worried that I couldn't sleep / couldn't have slept and I stay awake all night.

Can you / Are you able to hear the neighbours’ television? It’s far too loud!

Even though we were cold and tired, we were able to / manage to reach the top of the mountain.

Thank you for your job offer, but I am afraid I can’t/couldn't accept it.

He managed to/could run the marathon in less than three hours, although he hadn't been training regularly for ten days.

He couldn’t/can't get to the meeting on time yesterday, because his car broke down.