Do both Un giorno di regno and Semiramide contain two acts?
Un giorno di regno Un giorno di regno, ossia Il finto Stanislao ("A One-Day Reign, or The Pretend Stanislaus", but often translated into English as "King for a Day") is an operatic "melodramma giocoso" in two acts by Giuseppe Verdi to an Italian libretto written in 1818 by Felice Romani.
La gazza ladra La gazza ladra (] , The Thieving Magpie) is a "melodramma" or opera semiseria in two acts by Gioachino Rossini, with a libretto by Giovanni Gherardini based on "La pie voleuse" by Théodore Baudouin d'Aubigny and Louis-Charles Caigniez.