<em>Carlos, ¿Se </em><em>acuerda </em><em>de cuando fuimos de vacaciones a Cancun hace dos años?</em>
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<h2>Explanation:</h2>
This question stands for reflexive pronouns. We use Reflexive Pronouns with a verb to point out that a person carries out an action to or <em>for himself</em> or <em>herself. </em>The action here is to remember something. Since a person is addressing the question to Carlos and uses se, then this matches the subject pronoun usted (formal you). Then the conjugation of acordar must match the third person singular, which is acuerda.
