ZERO Conditional: Used for things that are generally true (rules, laws...) IF / WHEN + Present Simple, When I have a stomach ache, Present Simple I go to the doctor FIRST Conditional: Used for likelihood, probability, logic IF + Present Simple, Future Simple IF you don’t drink water, you WILL have a headache. SECOND Conditional: Used to talk about things that probably won’t happen IF + Past Simple, WOULD + infinitive If I won the lottery, I would travel the world THIRD Conditional: Used to talk about how things could have been different in the past. IF + Past Perfect IF I had slept longer, WOULD HAVE + Past participle I WOULD HAVE felt better this morning
