What's the verb?
climb
What are they doing?
dancing
What's she doing?
swimming
What's he doing?
fishing
What's the verb?
fish
What's this?
outside
What's this?
inside
What's he doing?
CLIMBING
What's she doing?
skating
What's the verb?
dance
What's the verb?
swim
What's the verb?
skate
What are they doing?
sailing
What's the verb?
sail