What hobby is it?
Skateboard / Skateboarding
What hobby is it?
Surf / surfing
What hobby is it?
Cycle / Cycling
What hobby is it?
Table tennis
What hobby is it?
Basketball / Playing basketball
Are they surfing?
Yes, they are.
Are they sailing?
No, they aren't. There surfing.
Are they playing chess?
No, they aren't. There sailing,
Are they doing Judo?
No they aren't. There playing chess.
