Answer:
Fueron
Explanation:
Van is the future form.
Estan is the present form.
Fuiste is referring to the past but just to one person, not multiple.
The indirect object is animales
So it basically says “ Currently, do the demos have a diacritical mark? Write two sentences with a demonstration ( different from the example). In one sentence it must be a determinant and in the other a pronoun” Simple maybe