Answer: " estuvieron" .
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" Uds. estuvieron en la clase de inglés. "
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Note: The verb given is "están" ; which is the "present tense" conjugation of the Spanish verb "estar" , {"to be" ; when referring to location); for the "third person, plural" — and as such, appropriately corresponding to the Spanish subject pronoun, "Uds" ("ustedes"); the plural form of "you" (as in "you all").
As such, the conjugation of the "preterite form" of the Spanish verb, "estar" ; corresponding to the "third person, plural" subject pronoun — which is "Uds." in this case — is: " estuverion " .
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