He was an astronaut.
Was he an astronaut?
Was he an astronaut or a pilot?
He was an astronaut, wasn't he?
Who was an astronaut? What was he?
They had a walk in the garden.
Did they have a walk in the garden?
Did they have a walk in the garden or in the park?
They had a walk in the garden, didn't they?
Where did they have a walk? Who had a walk in the garden?
They sang.
Did they sing?
Did they sing or dance?
They sang, didn't they?
Who sang? What did they do?