John __________ solve this puzzle yesterday, but he needs more time today.
was able to
Despite the heavy traffic, I __________ arrive at the airport on time yesterday.
was able to
I ______ swim in those days. Now I'm scared of water!
could / was able to
After searching for hours, they __________ find their lost dog last night.
were able to
I __________ play the piano when I was a child, but now I’m learning.
couldn't / wasn't able to