To talk about scientific facts.
To talk about general or personal truths.
To talk about rules and laws.
Example: If I sleep badly, I am grumpy in the morning.
Condition (if-clause): present simple
Result (main clause): present simple
You can change the order of the sentence and the meaning stays the same:
If I sleep badly, I am grumpy in the morning.
or
I am grumpy in the morning if I sleep badly.
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