The correct verb form to complete the statement "(tú) anoche?" is "Saliste."
Here's an explanation to help you understand why:
1. "Saliste" is the correct form of the verb "salir" in the second person singular (tú) past tense. It translates to "Did you go out?" or "Did you leave?" in English.
2. "Salías" is the imperfect tense form of the verb "salir" in the second person singular (tú), which means "you used to go out" or "you were going out" in English. This form doesn't match the question format of the sentence.
Therefore, the correct answer is "Saliste" as it fits the context of the question asking about an action that happened in the past, specifically last night.
