zero conditional : real possible situation, the result is always the same, not one-time situation, If + Present Simple, Present Simple, If I sleep less than 6 hours, I feel exhausted. , first conditional : real possible one-time situation (true only for this particular event), If + Present Simple, will / going to / modal verb + Verb, If I have some free time later, I'll help you., second conditional: impossible present / future situations, unlikely to happen, If + Past Simple, would / could / might + Verb, If I were you, I would break up with him., third conditional : unreal situations, conditions and results are all in the past and can't be changed , If + Past Perfect / Past P. Continuous, would / might / could + have done, If I had known you were coming, I would have cooked something. , mixed conditional (1): condition is in the past, unreal, the result is in the present, If + Past Perfect, would / might / could + Verb, If I hadn't eaten that burger, I wouldn't be ashamed of myself now., mixed conditional (2): condition is in present and unreal, the result is in the past, If + Past Simple, would / could / might + have done, If I weren't so lazy, I would have started jogging long time ago.,

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