1.
Have you ever seen a dodo?
You have never seen a dodo, haven`t you?
What have you never seen?
Who have never seen a dodo?
How often have you seen a dodo?
2.
Did your grandparents see a dodo?
Your grandparents never saw a dodo, didn`t they?
Who never saw a dodo?
Whose grandparents never saw a dodo?
What did they never see?