What's this? What is he doing?
Create an animation / He's creating an animation
What's this? What is she wearing?
She's wearing a costume
What's this?
It's a stage.
What's this?
It's a stage.
What's this? What are they doing?
It's make jewellery / They're making jewellery
What's this? What is she doing?
She's doing ceramics /making pottery (do ceramics / make pottery)
