1
negative:i don't have lunch at 11 o'clock
question:when do you have lunch?
2
negative:Tony isn't my best friend
question:What is your best friend?
1.
(-) : I don't have lunch at 11 o'clock.
(?) : Do you have lunch at 11 o'clock?
2.
(-) : Tony isn't my best friend.
(?) : Is Tony your best friend?