Ответ: You translated last sentence incorrectly
Ответ: Oh , I’m sorry. I could write such as you :’Им было весело?’But I think it is time of Present Simple
Ответ: I do not agree with you. It is said in her question: DID they have fun
Ответ: I mean: DID they enjoy the party
Ответ: Посмотри те на картинку и скажите, что Юлия и ее друзья делали на вечеринке. Им весело?