Mastering Conditionals: Zero and First Conditional (B1 English Grammar) — B1 English grammar lesson by Langcom

Mastering Conditionals: Zero and First Conditional (B1 English Grammar)

Raúl Maguiña

Gründer von Langcom | Prüfer für Cambridge- und SIELE-Prüfungen

September 15, 2026

B1✏️ Grammatik⏱️ 5 Minuten Lesezeit📅 Aktualisiert im September 2026
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The zero conditional describes general truths and scientific facts, showing what always happens under certain conditions. The first conditional, however, talks about real or possible situations and their likely outcomes in the future. Both structures use an ‘if’ clause to introduce the condition and a main clause to state the result. The key difference lies in the tense used in the main clause and the certainty of the outcome. For the zero conditional, both clauses use the present simple, indicating a universal truth. For the first conditional, the ‘if’ clause uses the present simple, but the main clause uses ‘will’ + base verb, pointing to a probable future event. Understanding these differences helps you express certainty and possibility accurately in English.

What is the Zero Conditional?

The zero conditional is used to talk about general truths, scientific facts, and things that always happen under certain conditions.

  • It describes a cause-and-effect relationship that is always true.
  • The result is certain every time the condition is met.

The structure for the zero conditional is simple:

  • If + present simple, present simple

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When Do We Use the Zero Conditional?

We use the zero conditional for:

  • General truths: Things that are always true in the world.
  • Scientific facts: Laws of nature or proven scientific principles.
  • Habits and routines: What you or others always do in specific situations.

You can often replace if mit when in zero conditional sentences without changing the meaning. This is because the result is always the same.

What is the First Conditional?

The first conditional is used to talk about real or possible situations in the future and their likely results.

  • It describes a specific condition and a probable outcome.
  • The result is not 100% certain, but it is very likely to happen.

The structure for the first conditional is:

  • If + present simple, will + base verb

When Do We Use the First Conditional?

We use the first conditional for:

  • Future possibilities: Things that might happen in the future.
  • Plans and predictions: What we expect to happen if a condition is met.
  • Warnings and advice: To tell someone what will happen if they do or don't do something.

In the first conditional, we usually use if because the situation is a possibility, not a certainty. Using when here would imply the condition is definite.

If vs. When: A Closer Look

Beides if und when can introduce conditional clauses, but they have different implications:

  • Verwendung if for things that are possible or might happen. The condition is not certain.
  • Verwendung when for things that are certain to happen. The condition is definite.

For example, you know the sun will rise tomorrow, so you might say When the sun rises, I will go for a walk. But if you're not sure about the weather, you'd say If it rains, I will stay home.

Zero vs. First Conditional Comparison
Feature Zero Conditional First Conditional
Use General truths, scientific facts, habits Real or possible future situations
'If' Clause Form If + present simple If + present simple
Main Clause Form present simple will + base verb
Certainty Always true, 100% certain result Probable, likely to happen (not 100% certain)
Example If you freeze water, it turns to ice. If it snows, we will build a snowman.
'When' usage Often interchangeable with if Generally not interchangeable with if (unless the condition is certain)

Beispiele

  • If you heat water to 100 degrees Celsius, it boils. (Zero Conditional - Scientific fact)
  • When I'm tired, I go to bed early. (Zero Conditional - General truth/habit)
  • If you mix blue and yellow, you get green. (Zero Conditional - General truth)
  • If it rains tomorrow, we will stay at home. (First Conditional - Future possibility)
  • If she studies hard, she will pass the exam. (First Conditional - Probable future outcome)
  • If I find your keys, I will call you immediately. (First Conditional - Specific future action)

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Häufige Fehler bei Spanischsprechern

Häufige Fehler bei Spanischsprechern

Spanish speakers often make a few common mistakes when using the zero and first conditional:

  • Using 'will' after 'if' in the first conditional: In Spanish, you might use a future tense in both parts of the conditional. However, in English, the 'if' clause always uses the present simple for the first conditional.
    Falsch: If it will rain, I will stay home.
    Richtig: If it rains, I will stay home.
  • Using 'will' in the zero conditional: Remember that the zero conditional is for things that are always true, not future possibilities. Both clauses need the present simple.
    Falsch: If you will heat ice, it will melt.
    Richtig: If you heat ice, it melts.
  • Confusing 'if' and 'when': While sometimes interchangeable in the zero conditional, they are not in the first conditional. Use if for possibilities and when for certainties.
    Falsch: When I win the lottery, I will buy a house. (Winning is not certain)
    Richtig: If I win the lottery, I will buy a house.

Häufig gestellte Fragen

What is the main difference between the zero and first conditional?

The zero conditional describes things that are always true or always happen (If you heat water, it boils.). The first conditional describes a real possibility in the future and its likely result (If it rains, we will cancel the picnic.).

Can I use 'when' instead of 'if' in conditional sentences?

Yes, in the zero conditional, you can often use when statt if because the result is always true. For example, When I eat too much, I feel sick. However, for the first conditional, use if because the situation is a possibility, not a certainty.

What tenses are used in the zero conditional?

In the zero conditional, both the 'if' clause and the main clause use the present simple tense. For example, If you don't water plants, they die.

What tenses are used in the first conditional?

In the first conditional, the 'if' clause uses the present simple, and the main clause uses will + base verb. Zum Beispiel:, If I have time, I will help you.

Verwandte Lektionen

Über den Autor: Raúl Maguiña

Raúl Maguiña ist Leiter der Asociación Educativa Langcom, einem autorisierten Cambridge English-Vorbereitungszentrum in Ihr Land. Mit mehr als einem Jahrzehnt Erfahrung in der Sprachausbildung und der internationalen Zertifizierung hat er Tausenden von Schülern, Lehrern und Bildungseinrichtungen in 25 Ländern zu Cambridge-, IELTS-, TOEFL- und Michigan-Englischzertifikaten verholfen.

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