Логика такая: чтобы составить отрицательное предложение в прошедшем времени, используй didn't + начальную форму глагола.
- She sang a song at the party. She didn't sing
- We had breakfast at 7 o'clock. We didn't
- They went to the park yesterday. They didn't go to the park yesterday.
- I saw a ghost in the forest. I didn't see a ghost in the forest.
Ответ: They didn't go to the park yesterday. I didn't see a ghost in the forest.