If I (finish) my homework, I (watch) TV.
If I finish my homework, I will watch TV.
If you (heat) water, it (boil).
If you heat water, it boils.
If it (rain) tomorrow, we (stay) at home.
If it rains tomorrow, we will stay at home.
If people (not eat), they (get) hungry.
If people don’t eat, they get hungry.
If she (study) hard, she (pass) the test.
If she studies hard, she will pass the test.
If you (touch) fire, you (get) burned.
If you touch fire, you get burned.