What are they doing?
They are collecting money for charity.
What is this?
This is a band
What is she doing?
She is playing on the soccer team
What are they doing?
They are playing in the school band
What extra-curricular activities do you know?
...
What is he doing?
He is learning a new language
What are they doing?
They are playing in the school orchestra
What is this?
This is orchestra
What is she doing?
She is taking singing lessons