zero conditional

1. 1. If you freeze water, it turns into ice.
2. If I work too much, I get tired.
3. If I have time, I usually go to the movies.

2. 1. If she eats hamburgers, she gets an allergy.
2. If they come here, they always bring a present.
3. If she doesn't know the answer, she keeps silent.
4. If we don't go out on Saturdays, we rent a video and stay home.

3. 1. If public transport is efficient, people stop using their cars.
2. If you heat water to 100 degrees, it boils.
3. Plants die if they don’t get enough water.