Final answer:
The conjugation of the verb 'comer' for the pronoun 'you guys' in the past tense is 'comían'.
Step-by-step explanation:
In Spanish, the conjugation of the verb comer (to eat) for the pronoun 'you guys' in the past is comían. So the correct translation of the given sentence 'You guys used to eat at that restaurant all the time, right?' would be 'Ustedes comían en ese restaurante todo el tiempo, ¿verdad?'
Learn more about Verb conjugation in Spanish