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I was sleeping when someone knocked at the door.
Was I  sleeping when someone knocked at the door?
What was I doing when someone knocked at the door?
Who was  sleeping when someone knocked at the door?
Was I sleeping or reading a book  when someone knocked at the door?
I was sleeping when someone knocked at the door, wasn't I?
I wasn't sleeping when someone knocked at the door.

When mum came home I was doing my homework.
When mum came home I wasn't doing my homework.
What were you doing when mum came home?
Were you doing your homework when mum came?
Were you doing your homework or listening to the music when mum came?
You were doing your homework when mum came, weren't you?