If you freeze water, it turns into ice.
If I work too much, I get tired.
If I have time, I usually go to the movies.
If they come here, they always bring a present.
If she doesn't know the answer, she keeps silent.
If it rains today, I'll stay at home.
If he is busy now, I will come back tomorrow.
If I have time, I'll visit my parents this afternoon.
If it is cold, you must wear warm clothes.
If she doesn't call you, you can call her.
If I won the lottery, I would travel around the world.
If I were you, I would buy that car.
If it were not raining, we could go out.
If I saw her, I would ask her out.
If I didn't want to go, I would tell you.
If I had won the lottery, I would have traveled around the world.
If I had known the answer, I would have raised my hand.
If she had explained me the problem, I would have understood it.
If it hadn't rained, we would have gone fishing.