I Can = Μπορώ

Singular -  Ενικός
I can dance You can dance He can dance She can dance It can dance	Can I dance? Can you dance? Can he dance? Can she dance? Can it dance?	I can not dance You can not dance He can not dance She can not dance It can not dance	I can’t dance You can’t dance He can’t dance She can’t dance It can’t dance
Plural - Πληθυντικός
We can dance You can dance They can dance	Can we dance? Can you dance? Can they dance?	We can not dance You can not dance They can not dance	We can’t dance You can’t dance They can’t dance

Can you dance?

Yes, I can.

Can you ride a bike?

No, I can't. 

Can John play football?

Yes, he can.

Can Nefeli jump?

Yes, she can.

Can Anastasios fly?

Yes, he can.
He is a superman.

Can a fish swim?

Yes, it can.

Can a dog climb?

No, it can't.

Can you swim?

Yes, we can.

Can cats run?

Yes, they can.