The singular Sii buona! and plural Siate buone! in the feminine and the singular Sii buono! and the plural Siate buoni! in the masculine are Italian equivalents of the English phrase "Be good!" The choice depends upon the gender and number of the listener or listeners. The respective pronunciation will be "see BWO-na" and "SYA-tey BWO-ney" in the feminine and "see BWO-no" and "SYA-tey BWO-nee" in the plural in Italian.
"Good" in English is buono in Italian.
"It is good!" in English is È buono! in Italian.
"Good night!" in English is Buonanotte! in Italian.
"Good! And you?" in English is Buono! E tu? in Italian.
"Good! How are you?" in English is Bene! Come stai? in Italian.
"Good food!" in English is Buon cibo! in Italian.
"Good health" in English is buona salute in Italian.
"Good head!" in English is Buona testa! in Italian.
"Good artist!" in English is Buona artista! in Italian.
"Good fortune" in English is buona fortuna in Italian.
"Good lover" in English is buon amante in Italian.
"Good vacation" in English is buona vacanza in Italian.