Respuesta :
For this case we have that by definition, the indicative conjugation of the simple perfect preterite of the verb "ir" is given by:
yo fui
tú fuiste
él, ella, Ud. fue
nosotros fuimos
vosotros fuisteis
ellos, ellas, Uds. fueron
The given sentence can be translated as:
My brother and I ___________ to the supermarket
It is observed that it is spoken in the first person including a third person. So, we use: "Nosotros fuimos"
Completing the sentence we have:
Mi hermano y yo fuimos al supermercado
ANswer:
Mi hermano y yo fuimos al supermercado