1) When I come home they'll be having a supper.Will they be having a supper when I come home?
Will they be having a supper or watching TV when I come home?
When I come home they'll be having a supper, won't they?
Who will be having a supper when I come home?
What will they be doing when I come home?
2) He refused to take this offer.Did he refuse to take this offer?
Did he or she refuse to take this offer?
Who refused to take this offer?
He refused to take this offer, didn't he?
What did he refuse to take?