se questo fosse

if this were

→ se
phrase Rare #22,454
if this were Used to introduce a hypothetical situation; fosse is the imperfect subjunctive form of essere (to be).
IT: Se questo fosse vero, saremmo tutti felici.
EN: If this were true, we would all be happy.

Cosa faresti se questo fosse il tuo ultimo giorno?

What would you do if this were your last day?

Come se questo fosse possibile.

As if that were possible.

— L'organo genocida (2017)

Cosa farebbe se questo fosse il suo ultimo giorno?

What would you do if this were your last day?

Che cosa faresti se questo fosse il tuo ultimo giorno?

What would you do if this were your last day?