Final answer:
The preterit conjugation of 'subir' for 'ustedes' is 'subieron'.
Step-by-step explanation:
The preterit conjugation of the verb 'subir' for the pronoun 'ustedes' is 'subieron'. In the preterit tense, the conjugation of 'subir' changes based on the subject pronoun. For 'ustedes', which means 'you all' or 'you guys' in Spanish, the conjugation is 'subieron'.
Learn more about Conjugation of 'subir' in the preterit tense for 'ustedes'