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?