Whose father used to play tennis when he was a child? Who used to play tennis when was a child? What did your father use to do when he was a child? Your father used to play tennis, when he was a child, didn't he? Did your father use to play tennis when he was a child?
Who used to play tennis when was a child?
What did your father use to do when he was a child?
Your father used to play tennis, when he was a child, didn't he?
Did your father use to play tennis when he was a child?