The Zero conditional
If + subject + present simple , subject + present simple
. This case is used for situations that are always true (laws of nature, physics, astronomy, etc.
تعبر عن حقائق ثابتة مثل قوانين الطبيعة والفيزياء والفلك الخ ….
☺ If water is heated to 100c, it boils.
☺ If the moon passes between the sun and the Earth, there is a solar eclipse.
كما أنها تعبر عن عادات ثابتة
☺ If I feel tired, I usually go to bed. If = When
Heat changes water into steam. (If)
The body dies due to the stop of the brain. (if)
Not getting enough water, plants die. (If)