If + present tense - for talking about facts, If + future tense - for talking about likely situations, If + past (+ would/might) - for talking about unreal or imaginary situations, If + past perfect (+ would/might have +past) - for talking about regrets or when we feel relief, If + past perfect (+ would /could/might have been) - to talk about things that are no longer possible because of what has already happened,

Conditionals

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