surf
swim
dive
snorkel
sail
surf
He is swimming
He is swiming.
dive
snorkel
They are kayaking.
They are surfing.
waterski
windsurf
He's waterskiing.
He isn't waterskiing.
He's windsurfing
She are snorkeling.
She is snorkel.
She is snorkeling.
kayak
sail
windsurf
waterski
They are sailing.
They is sailing.
They are sail.
surf
snorkel