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General truths and cause-effect with present simple in both clauses.
Why you specifically
The rule
The zero conditional talks about general truths, facts, and regular cause-and-effect results. Use the present simple in both clauses: If + present simple, present simple. We often use it for scientific facts, instructions, habits, and fixed results.
The trap
If you heat water to 100°C, it boil.
If you heat water to 100°C, it boils.
In the zero conditional, both clauses use the present simple to show a general truth or scientific fact.
If people do not sleep enough, they will feel tired.
If people do not sleep enough, they feel tired.
The verb in the result clause must also be in the present simple.
If I am late, my boss will be unhappy.
If I am late, my boss is unhappy.
In general truths and fixed results, use present simple in both clauses, including the verb be.
If you mix red and blue, you will get purple.
If you mix red and blue, you get purple.
Use present simple after if and in the main clause when the sentence expresses a regular result.
Prove it
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