LAE

CAUSE & EFFECT

GRANNAR:
IF-CLOUSE: IF/WHEN + SIMPLE PRESENT
MAIN CLAUSE: SIMPLE PRESENT

IF/WHEN YOU HEAT WATER, IT BOILS

USE: To express a general truth or a scientific fact. in this type of conditional, we can use when instead of if

example: 
when the sun is out, it heats the water in the oceans.
when the sun heats the water in the oceans, there is vapor
when the vapor.
when vapor rises into the air, it forms clouds.
when water droplets in clouds get too heavy, it rains.
when it rains, the water runs off the ground or into lakes and rivers.