ZERO CONDITIONAL

The zero conditional is used when the condition and consequence are always true. It is used for example in scientific facts or situations that we know with certainty to be true.

structure :

IF	condition	result
If	present simple	present simple

examples:

-if you go out without an umbrella, you get wet
-If I work too much, I get tired. 
-If you freeze water, it turns into ice.
-If people eat too much, they get fat.
-If babies are hungry, they cry.