If you … (heat) water to 100 degrees Celsius, it … (boils).
If the sun … (goes) down, it … (gets) dark.
We'll … (stay) at home, if it … (snows).
If he … (were) rich, he would (buy) an island.
It it … (rains), the grass … (gets) wet.
If you … (do not/ hurry), you'll … (miss) the train.
If it … (rains) today, you'll … (get) wet.
If I … (spoke) Italian, I would (work) in Italy.