Zero Conditional: certainty We use the so-called zero conditional when the result of the condition is always true, like a scientific fact. Notice that we are thinking about a result that is always true for this condition. The result of the condition is an absolute certainty.
Zero conditional: structure If condition result Present Present simple simple If you heat ice, it melts. Result if condition Present Present simple simple Ice melts if you heat it.
Zero conditional: examples If you freeze water, it becomes a solid. Plants die if they dont get enough water. If you mix red and blue, you get purple. Water boils if you heat it to 100°C.
First Conditional: real possibility We are talking about the future. We are thinking about a particular condition or situation in the future, and the result of this condition. There is a real possibility that this condition will happen.
First conditional: structure If condition result will / can / may / Present simple must + verb I will stay If it rains, home. Result if conditionwill / can / may / must + verb Present simple I will stay if it rains. home
First conditional: examples If they do not pass their exam, their teacher will be sad. He will invite Tara if she is free tomorrow. If you drink too much, youll get drunk. You must wear warm clothes if it is cold.
Second conditional: unrealpossibility or dream We are still thinking about the future. We are thinking about a particular condition in the future, and the result of this condition. But there is not a real possibility that this condition will happen, like a dream.
Second conditional: structure If condition result would / could / Past simple might + verb If I won the lottery, I would buy a car. Result if condition would / could / might + verb Past simpleI would buy a car if I won the lottery
Second conditional: examples If I were in Brazil, I would go to Rio de Janeiro. If I were an alien, I would be able to travel around the universe. I could buy a big house if I had a million dollars. We would learn a lot from dolphins if they could talk.