English Conditional Sentences: Zero, First, Second, Third

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