1) Did he have to buy a ticket? Yes,
he did.
2) Did he buy the ticket? Yes, he did.
3) Does he have to buy a ticket? Yes, he does.
4) Will he buy a ticket? Yes, he will.
5) Is there a ticket there? Yes, there is.
6) Is it a ticket? Yes, it is.
7) Did it take him five minutes to buy a ticket? Yes, it did.
8) Does he buy tickets there? Yes, he does.