A: Are they going skiing?
B: No, they aren't. They are playing in the snow.
A: Do they often play in the snow in winter?
B: Yes, they do.
A: What are you doing?
B: I'm watching TV.
A: Are you going camping?
B: Yes, we are.
A: What are you doing?
B: I'm reading a book.
A: Are you having a picnic?
B: Yes, we are.
A: Are they playing in the snow?
B: Yes, they are.