Zero Conditional
The zero conditional is a grammatical structure used to talk about general truths or about situations that are real and possible. It is used to talk about scientific laws, general truths, and to give instructions.
General truths are part of practical and everyday knowledge. That is, they are things that happen if there is a given condition and are generally expressed with the simple present.
Structure: If + subject + verb in simple present, subject + verb in simple present.
Example:
If you mix yellow and blue, you get green.
If the phone rings, don't answer.
If you put an ice cube in the sun, it melts.
