There are four kinds of conditionals
The Zero Conditional:
(if + present simple, ... present simple)
If you heat water to 100 degrees, it boils.
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The First Conditional:
(if + present simple, ... will + infinitive)
If it rains tomorrow, we'll go to the cinema.
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The Second Conditional:
(if + past simple, ... would + infinitive)
If I had a lot of money, I would travel around the world.
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The Third Conditional
(if + past perfect, ... would + have + past participle)
If I had gone to bed early, I would have caught the train.
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