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. Semiramide: Semiramide (] ) is an opera in two acts by Gioachino Rossini.
yes