operational [ˌɒpəˈreɪʃənl] adjective 1. [ready for use] pronto ( f pronta) per l'uso [in use] in funzione, operativo ( f operativa) 2. [concerning function, running] di gestione
Complétez la séquence avec la proposition qui convient. “Smoking is forbidden” means you … smoke. need to needn't mustn't