Zero Conditional (if + present simple, ... present simple)
• If you heat the water to 100 degrees, it boils.
• If I am late, my father takes me to school.
• She doesn't worry if Julian stays out after school.
• If people eat too much, they get fat.
• If I have time, I usually go to the movies.
First Conditional (if + present simple, ... will + infinitive)
• If it rains tomorrow, we'll go to the cinema.
• If it rains, we will stay at home.
• He will arrive late unless he hurries up.
• Simon will buy a new car, if he gets his raise.
• If I have time, I will visit you.
Second Conditional (if + past simple, ... would + infinitive)
• If I had a lot of money, I would travel around the world.
- If we were in London today, we would be able to go to the concert in Hyde Park.
- If I had millions dollars, I'd give a lot to charity.
- If there were no hungry people in this world, it would be a much better place.
- If everyone had clean water to drink, there would be a lot less disease.
Third Conditional (if + past perfect, ... would + have + past participle)
• If I had gone to bed early, I would have caught the rain.
• If he had known that, he would have decided differently.
• Joanna would have found a new job if she had stayed in Gorzów.
• If I had had time, I would have gone to the football match.
• She wouldn't have been tired if she had gone to bed earlier.