Zero Conditional in English: Rules, Uses and Examples

If you want to understand the zero conditional in English, this lesson will help you use it clearly and correctly. We use the zero conditional to talk about facts, general truths, habits, and results that always happen when a particular condition is met.

What Is the Zero Conditional?

The zero conditional is used to talk about things that are always true. These are situations where the result always happens if the condition occurs.

In zero conditional sentences, both the if-clause and the main clause are usually in the Present Simple tense.

Structure

If + Present Simple, Present Simple

or

Present Simple + if + Present Simple

Examples

• If I can’t sleep, I listen to the radio.
• If you see Tom, tell him to give me a call.
• I can’t study unless I have peace and quiet.
• If people eat too much sugar, they gain weight.

Using the Zero Conditional for General Truths

The zero conditional is commonly used for general facts, scientific truths, and natural laws.

Examples

• Ice melts if you heat it.
• If you water the grass, it grows.
• Water boils if you heat it to 100°C.
• Plants die if they don’t get enough sunlight.

These sentences describe things that always happen under certain conditions.

Zero Conditional for Habits and Routine

We also use the zero conditional to describe things that regularly happen or people’s habits.

Examples

• Paul always phones me if he is bored.
• If I feel tired, I drink a cup of coffee.
• Children build snowmen if there is enough snow.
• If she finishes work early, she goes for a walk.

In these sentences, the result is something that usually happens when the condition is met.

Using Imperatives in Zero Conditionals

Sometimes the main clause can be an imperative, especially when we are giving instructions or advice.

Examples

• If Jane calls, tell her where I am.
• If the doorbell rings, don’t answer it.
• If you see Mark, ask him about the meeting.
• If you feel unwell, call a doctor.

Using When Instead of If

In zero conditional sentences, we can often use when instead of if without changing the meaning. This is because the result is something that always happens.

Examples

• When the weather is nice, we usually go for a walk.
• My mum cries when she is sad.
• When people are tired, they make mistakes.
• When winter comes, the days become shorter.

Punctuation in Conditional Sentences

When the if-clause comes at the beginning of the sentence, we usually put a comma before the main clause.

Examples

• If you see Tom, tell him to call me.
• If it rains, we stay at home.

However, when the main clause comes first, a comma is usually not necessary.

• Tell him to call me if you see Tom.
• We stay at home if it rains.

Quick Summary

The zero conditional is used to talk about:

• general truths
• scientific facts
• habits and routines
• instructions or advice

Structure

If + Present Simple, Present Simple

Example:

If you heat ice, it melts.

Learning the zero conditional will help you describe facts, rules, and everyday situations more naturally in English.

Zero Conditional – Practice Worksheet in PDF

Related posts:

First Conditional

Second Conditional

Third Conditional

Mixed Conditional

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