Conditional Type Zero: Definition, Use and Examples

What's conditional type 0?

The Zero Conditional (Type 0) is used to talk about things that are always true. It refers to general truths, scientific facts, laws of nature, or habits that happen the same way every time.

Unlike Type 1, which talks about a specific future possibility, Type 0 talks about universal certainties.

Structure

The Zero Conditional uses the same tense in both clauses: the if-clause (the condition) and the main clause (the result).

If + Present Simple, ... Present Simple

Because the result is a fact, you can almost always replace "if" with "when" without changing the meaning.

Example: Ice melts if you heat it.

Uses & Examples

1. Scientific Facts & Nature

If you freeze water, it becomes a solid.

When the sun goes down, it gets dark.

2. Habitual Actions & Routines

• If I drink too much coffee, I can't sleep at night.
• If my sister is late for work, her boss gets angry.

Giving Instructions

In Type 0, the result clause can also be an imperative. This is common for giving clear rules or technical advice.

If the alarm rings, exit the building immediately. (Rule)

If you need more paper, press the button on the screen. (Instruction)

Grammar Note: Commas and Order

Remember the comma rule: if the If/When clause comes first, use a comma. If the main clause comes first, no comma is needed.

• With Comma: If it rains, the grass gets wet.
• Without Comma: The grass gets wet if it rains.

Read also:

• Conditional type 1
• Conditional type 2
• Conditional type 3