Zero Conditional

FORM

If + present simple, present simple

Note:
- if + present simple = i.e. real things (situation or condition)
- present simple = i.e. real result

USAGE

Zero conditional is used to talk about facts / something that will definitely happen when the condition is true (or happens); for examples, 

• If you press that button, the lights turns off.
• It turns gray if we mix black and white.
• If water gets 100 degree Celsius, it boils.
• If you touch a fire, you get burned.
• People die if they don't eat.