Zero Conditional: Facts, Rules, and Predictable Results

The Zero Conditional describes relationships that are generally true whenever the condition occurs. It is especially useful for facts, routines, instructions, technical processes and repeated cause-and-effect patterns.

The core pattern

If + Present Simple, Present Simple: If water reaches 100°C at sea level, it boils. The sentence is not predicting one future event; it describes a general relationship.

Rules and procedures

The structure is common in instructions: If a student misses the deadline, the system sends a reminder. In professional writing, this makes policies and workflows concise.

When and whenever

Because the meaning is general, when or whenever can sometimes replace if: When I drink coffee late, I sleep badly.

Imperatives are possible

In practical instructions, the result can be an imperative: If the screen freezes, restart the application. The relationship is still predictable and procedural.

Zero versus First Conditional

Compare If I work late, I get tired (a repeated pattern) with If I work late tonight, I will get tired (a specific future possibility). The grammar changes because the speaker’s meaning changes.

Common mistake

Do not automatically add will simply because an if-clause appears. Ask whether you mean a general truth or a specific future consequence.

Practice

Complete naturally: If people do not sleep enough, … / If the payment fails, … / If I skip breakfast, …

Key idea: Zero Conditional means “whenever this happens, this is the normal result.”