Il est utilisé pour parler de situations peu probables, quoique possibles, dans le futur.
if + prétérit ---> would + base verbale
MIXEDS CONDITIONALS
type 0 : If you go under water, the pressure increases (certitude)
type 1: If Bob works, he will pass the exam (possible)
type 2: If Bob worked, he would pass the exam (en théorie possible, mais...)
type 3 : If Bob had worked, he would have passed the exam (trop tard, Bob a raté son examen)