Can/Could/Be able to
Can: Expresses general ability in the present.
Could: Expresses general ability in the past.
Be able to: Expresses general ability in the past and present.
Examples:
I can play the guitar.
I could play the guitar when I was a child.
I’m able to play the guitar.
I was able to play the guitar when I was a child.
Tip of the week: Can/Could/Be able to.