Are they sailing?
Yes, they are sailing
Is he snorkeling?
No, he isn't snorkeling. He is swimming
Is he diving?
No, he isn't diving. He is windsurfing
Are we swimming?
No, we aren't swimming. We are diving.
Is she surfing?
Yes, she is surfing
Is she waterskiing?
Yes, she is waterskiing.
Are you kayaking?
Yes, I'm kayaking
Is he windsurfing?
No, he isn't windsurfing, he is snorkeling