Question

1. tus hermanas / ir / ir /concierto mañana por la noche

Explanation:

This is a Spanish language task to form a grammatically correct future tense sentence. The subject "tus hermanas" (your sisters) is plural feminine, so the verb "ir" (to go) conjugates to "van". The structure for "going to a concert" uses "ir a + el concierto" (el contracts to al), and the time phrase is added at the end.

Answer:

Tus hermanas van a ir al concierto mañana por la noche.