Задайте 5 вопросов (спец,общ,альтр,хвостик,общ): bob had to go to dentist

Bob had to go to dentist.
1 Did Bob have to go to dentist?
2 Did Bob have to go to dentist or to vet?
3 Who had to go to dentist?
4 Bob had to go to dentist, didn't he?
5 Whom did Bob have to go to?