I __________ help you with your project tomorrow if you’d like.
can
He’s really strong — he __________ lift that heavy box alone.
can
I’m exhausted; I __________ keep my eyes open any longer!
can't
I called you several times yesterday, but I __________ get an answer.
couldn't
Mark __________ read music when he was young, but he __________ play the guitar by ear.
couldn't/could
My sister __________ speak Italian before, but now she’s fluent.
couldn't
As a child, we __________ spend hours playing outside without getting bored.
could
Sorry, I __________ meet you yesterday — my car broke down.
couldn't
When I was ten, I __________ ride a horse, but now I __________.
could/can't or couldn't/can
She studied a lot, but she still __________ solve that math problem.
can't