Dad wasn't hanging the picture on the wall, when l came home.
Was dad hanging the picture on the wall, when you came home?
Was dad hanging the picture or a shelf on the wall, when you came home?
Who was hanging the picture on the wall, when you came home?
What was dad hanging on the wall, when you came home?
When was dad hanging the picture on the wall?
Where was dad hanging the picture, when you came home?
вроде так