Respuesta:
2) Did we use to go to the beach every summer?
3) She used to love eating chocolate but now she hates it.
4) He didn't use to smoke.
5) I used to play tennis when I was at a school.
6) she used to be able to speak French but she has forgotten it all.
7) Did he use to play golf every weekend?
8) they both used to have short hair.
9) Julie used to study Portuguese.
9) I didn't use to hate School.
El "used to" es como un "solíamos" una acción que ya no se repite o hacen en el presente. Cuando es afirmativa se coloca "useD to" y cuando es en interrogativo y negativa es "use to" (sin d) puesto que el "did" esta ya en pasado, y solo colocas: Did you use to eat...? / I didn't use to walk...