Question

ar preterit
yo é nosotros/as amos
tú aste vosotros/as asteis
él/ella/ usted ó ellos/ellas/ ustedes aron
¿ ______ (jugar) fútbol ayer tú?
jugaste
jugaron
jugamos

Explanation:

The question uses the subject "tú" (informal singular "you") and the preterite tense marker "ayer" (yesterday). For -AR verbs in preterite, the "tú" conjugation uses the ending "-aste". The verb "jugar" is an -AR verb, so we remove "-ar" and add "-aste" to get "jugaste".

Answer:

jugaste