The zero conditional is also called the present real
conditional
.  

STRUCTURE

If   +   Present Simple,   +  Present Simple

If you heat ice, It melts.

Present Simple   +   If    +    Present Simple

Ice melts If you heat it.


Examples:
If you want to be healthy, you need to eat properly
If you earn more money, you pay higher taxes.


USES

•        Rules
Ex:  If you take your cell phone into class, it must be turned
off.

•        Scientific Facts
Ex:  If you heat water to 100 degrees Celsius, it boils.  

•        General Truths
Ex:  you can be healthier, if you don’t smoke.

•        Cause and Effect
Ex:  If you push the button, the volume increases.

TOEIC - Zero Conditional

Learn English Pronunciation