Structure consisting of two sentences expressing a hypothesis and a consequence. In Italian there is a hypothetical period of reality, possibility and impossibility. If, for example, I say, 'se andiamo al cinema, prendo i pop corn'. This is a hypothetical that is real and therefore will definitely happen. If I say instead, 'se potessi andare al cinema, io vedrei una commedia'. In this case the thing is possible so I use the subjunctive to indicate a 'possibility' in the future. But if I say, 'se avessi avuto 16 anni in meno, avrei scelto il conservatorio'. This is an impossible action because if I am not 16 now, it will never be possible again!