Fill in the blank with the correct form of the verb.
No es cierto que ustedes ________(acostarse-2 palabras) temprano esta noche.
Answer: No es cierto que ustedes se acostaran temprano esta noche.
Translation: It is not true that you went to bed early tonight.
Explanation: The imperfect subjunctive tense is used in Spanish when the action of the main clause is in the present and the action of the subordinate clause occurs beforehand and has no connection with the present. As the subject is "Ustedes", which is the formal second-person in the plural, must be conjugated as the third-person in the plural. Ustedes se acostaran.