0.If you freeze water, it becomes a solid.
Plants die if they don't get enough water.
1.If it rains, we will stay at home.
If you do not know the way, I will pick you up.
2.If you studied harder, you would get better marks in your tests.
If I were rich, I would travel around the world.
3.If you had helped us, we would have finished the work in next to no time.
I would have called you earlier if I had not lost your phone number.