Conditional Zero and First

Zero Conditional :

This conditional refers to a situation that is always true:

If (always) + Present tense. Present tense:

Example: If I work too much, I get tired.

First Condicional:

It is used when a situation is real or possible. It is formed:

 if (always)+ present simple + Simple future:

Example: If it is cold, you must wear warm clothes.