Answer:
One group of irregular preterite verbs have a u as part of the stem of the verb. Four of the verbs in this group are estar (to be), tener (to have), poner construir (to construct).
Preterite - Irregular - u-stem Verbs.
yo--estuve--(I was)
vosotros--estuvisteis--(you guys were)
Ustedes/ellos/ellas--estuvieron--(you all/they were)
Explanation:
Hope this helped! :)
