Por la noche, mi novio ya había antes de yo llegar a casa (salir).

The correct conjugation of the verb "salir" in the sentence is:

- Por la noche, mi novio ya había salido antes de yo llegar a casa.

Explanation:

In Spanish, the Perfect Tense is characterized by the ending in the principal verb with "ado" or "ido" (as the exercise where the verb "salir" is conjugated in "salido"), in this case the auxiliar is the word "había", that in English is had, when you see words in Spanish as he, has, ha, hemos, han, había, habías, habíamos or habían, you'll know that the tense is present perfect.

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