What are the imperfect forms of "IR" for all pronouns?

1. no, no necesito ese taza.2. si, por favor.3. prefiero el flan por favor.4. no gracias.5. prefiero el helado de chocolate por favori hope this i did the best i could

Cuales opciones? lol

Pedro, josie, y heather fue a la quinceañera de virginia. the question is asking who went to the quinceañera. the person answering the question should answer using the ellos, ellas, and ustedes form if they were not part of that group of people.