Nosotros salimos (saldremos) a las ocho de la mañana
Explanation:
We can identify from the pronoun that the subject is in first person plural, so the verb must be as well. "Salir" (to leave) is an irregular verb, meaning that it has it's own conjugation rules. Since we don't know from context if the sentence is in present, past or future all of the forms are correct. Since salir is irregular it happens that first person plural is the same in simple past and present "salimos". "Saldremos" is the future first person plural.
