He is playing at school now.
Is he playing at school now?
He is playing at school now, isn't he?
Is he playing at school or at home now?
Who is playing at school now?
What is he doing now?
My parents went to Moscow last year.
Did my parents go to Moscow last year?
My parents went to Moscow last year, didn't they?
Who went to Moscow last year?
Did my parents go to Moscow or St Petersburg last year?
Where did my parents go last year?