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The present simple is used to express facts that are always true or events that always happen. This use is often described with the term "general truth":
A magnet attracts iron. The sun rises in the east. Water boils at 100 degrees Celsius.
if + present tense | present tense if + past tense | past tense
The zero conditional expresses that something is (or was) always true or that one action is (or was) always followed by another:
When we report zero conditionals, the following tense changes may occur:
For timeline diagrams, quotes and exercises, check out our e-book The Grammaring Guide to English Grammar