I can..
I can ride a bike.
I can't...
I can't surf.
I can...
I can swim.
He - soccer (question)
Can he play soccer?
I can...
I can rollerblade.
He - ride a bike (negative)
He can't ride a bike.
She - surf (affirmative)
She can surf.
They - Swim (question)
Can they swim?
She - basketball (negative)
She can't play basketball.
I can't
I can't play baseball.
What can they do? (play checkers)
They can play checkers.
What can he do?
He can skateboard.
She rollerblade (question)
Can she rollerblade?
They - judo (negative)
They can't do judo.
They - checkers (affirmative)
They can play checkers.
He - baseball (affirmative)
He can play baseball.
What can she do?
She can do judo.
What can you do? (ride a bike)
I can ride a bike.