In English, the following sentences have a different meaning.
If I were rich, I would live on Long Island.
If I am late, it is because the bus is late.
While the first sentence is using the irrealis mood, and it expresses something that will never happen (I will never be rich, and I will never live on Long Island), the second sentence is expressing a possibility (in the case I am late, that is because the bus is late).
Is there a way to express that also in Italian? Can I express the difference there is in those English sentences also in Italian, using two different moods or tenses?