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