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 you ______ (mix) red and blue, you ______ (get) purple.
If you mix red and blue, you get purple.