zero: If + present simple, .... present simple., If people eat too much, they get fat., is used when the result will always happen (facts), first: if + present simple, ... will + infinitive, If it rains, I won't go to the park., It's used to talk about things that might happen in the future, second: if + past simple, ...would + infinitive, If I won the lottery, I would buy a big house., use it to talk about things in the future that are probably not going to be true/something in the present which is impossible, because it's not true, third: if + past perfect, ...would + have + past participle, If she had studied, she would have passed the exam, used to describe a situation that didn't happen, and to imagine the result of this situation,

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