Zero conditional
If you ______ (heat) water to 100°C, it ______ (boil).
If you heat water to 100°C, it boils.
If it ______ (rain), the ground ______ (get) wet.
If it rains, the ground gets wet.
If people ______ (not water) plants, they ______ (die).
If people don’t water plants, they die.