2
If you mix blue and red , you get purple.
If I don't sleep well, I feel tired.
If people eat too much, they get fat.
If you freeze water, it turns to ice.
If you heat ice, it melts.
3
If he exercises more, he will lose weight.
If I feel thirsty, I will buy a bottle of water.
If you eat too much junk food, you will get ill.
If she avoids fizzy drinks, she will be fit and healthy.
If I have some free time, I will take up a hobby.