B1 · Intermedio Capítulo 14

¡Habla con total seguridad sobre realidades y verdades constantes!

5 Reglas totales
60 ejemplos
6 min
Reglas en este capítulo Práctica rápida

Chapter in 30 Seconds

Master the art of stating facts and universal truths with confidence.

  • Use the zero conditional to describe natural laws.
  • Explain daily routines and personal habits clearly.
  • Distinguish between certainty and future possibilities.
Speak with the certainty of truth.

Lo que aprenderás

¿Alguna vez te has sentido un poco inseguro al explicar cómo funciona algo o al describir tus rutinas diarias en inglés? ¡No te preocupes! En este capítulo, vamos a llevar tu nivel B1 al siguiente nivel dominando el Zero Conditional. Aprenderás a expresar esas verdades universales que nunca cambian —como las leyes de la naturaleza— y a describir tus hábitos con una precisión increíble. Te enseñaremos la diferencia clave entre usar if y when para que dejes de adivinar; por ejemplo, sabrás exactamente por qué dices when para algo que ocurre con regularidad y if para una posibilidad general. Imagina que estás dándole instrucciones a un colega para usar una máquina en la oficina o explicándole a un amigo tu receta favorita: entender estas estructuras te permitirá sonar lógico y profesional. Además, despejaremos la duda eterna entre el Condicional Cero y el Primero, para que sepas diferenciar una verdad científica de una posibilidad futura. Al terminar, serás capaz de explicar procesos técnicos, dar instrucciones paso a paso y hablar de tus reglas personales de vida con una fluidez natural. ¡Es momento de que tu inglés suene tan sólido y claro como tú!

Learning Objectives

By the end of this chapter, you will be able to:

  1. 1
    By the end you will be able to: Formulate sentences describing scientific facts using the zero conditional.

Guía del capítulo

Overview

Ready to elevate your B1 English grammar and speak with more precision about the world around you? This chapter is your go-to guide for English talking about facts and constant truths. As you navigate everyday situations and travel, you'll often need to explain how things work, describe routines, or state universal laws.
Mastering this skill isn't just about sounding correct; it's about communicating clearly and confidently.
We'll dive into the versatile Zero Conditional, a powerful structure that helps you articulate things that are always, undeniably true. You'll learn how to express everything from scientific facts to your daily habits and even simple instructions. A key focus will be understanding the subtle but important difference between using 'if' and 'when' within these constant truths, allowing you to choose the most precise word.
We'll also briefly touch on how the Zero Conditional differs from the First Conditional, ensuring you can distinguish between absolute certainties and likely future possibilities. By the end, you'll be able to discuss general truths and everyday patterns like a pro!

How This Grammar Works

At its heart, the grammar for talking about facts and constant truths revolves around the Zero Conditional. This structure is used when a certain condition always leads to the same, guaranteed result. Think of it like a universal law or an unbroken chain of cause and effect.
The most important rule to remember is that you use the Present Simple tense in *both* parts of the sentence.
Let's look at how it applies to different situations:
First, for General Truths, it's about scientific facts or universal observations. For example,
If you heat ice, it melts.
Or,
Water boils if you heat it to 100 degrees Celsius.
Here, the condition (heating ice/water) *always* results in the same outcome (melting/boiling).
Next, for Habits and Routines, the Zero Conditional describes things that are always true for a person or group. You might say,
When I wake up early, I always feel tired.
Or,
If my dog hears the doorbell, she barks loudly.
Notice how 'when' can often be used interchangeably with 'if' in these scenarios, especially when describing regular occurrences or routines.
It's also excellent for giving Facts and Instructions. If you're explaining how something works or giving directions, this is your go-to.
If you press this button, the machine starts.
Or,
The printer runs out of ink quickly if you print many photos.
The action always leads to the stated result.
Finally, let's clarify If vs When and the Zero vs First Conditional. In the Zero Conditional, 'if' and 'when' are often interchangeable for general truths, as both suggest a guaranteed outcome.
If it rains, the grass gets wet
means the same as
When it rains, the grass gets wet.
However, the key distinction is between the Zero Conditional and the First Conditional.
The Zero Conditional is for things that *always* happen (e.g.,
If you mix blue and yellow, you get green
). The First Conditional is for specific future possibilities that are likely to happen (e.g.,
If it rains tomorrow, we will stay inside
). Knowing this difference is crucial for precise communication in B1 English grammar.

Common Mistakes

It's easy to make a few common errors when you're first learning to talk about facts and constant truths. Here are some to watch out for:
  1. 1Mixing tenses in the Zero Conditional
* ✗ If you will heat water, it boils.
* ✓ If you heat water, it boils.
* *Explanation:* Both clauses in the Zero Conditional must use the Present Simple tense because we're talking about something that is *always* true, not a future possibility.
  1. 1Using Zero Conditional for a specific future possibility
* ✗ If it rains tomorrow, we stay inside.
* ✓ If it rains tomorrow, we will stay inside.
* *Explanation:* The Zero Conditional is for universal truths and habits. For a specific event that is likely to happen in the future, you need the First Conditional (Present Simple + will + base verb).
  1. 1Overusing 'if' when 'when' implies stronger certainty or routine
* ✗ If the alarm clock rings, I get up. (Grammatically fine, but 'when' is often more natural for routines)
* ✓ When the alarm clock rings, I get up.
* *Explanation:* While 'if' is correct, 'when' often feels more natural and emphasizes the regularity or expected occurrence of the condition for habits and routines.

Real Conversations

Here are a few quick dialogues showing how these grammar patterns appear in everyday B1 English conversations:

A

A

How do you manage to stay so calm under pressure?
B

B

Oh, that's easy! If I feel stressed, I always take a few deep breaths. It really helps.
A

A

I'm trying to grow tomatoes, but they keep dying. Any tips?
B

B

Hmm, well, if the soil is too dry, they don't grow well. And when the sun gets too hot, you need to water them twice a day.
A

A

This coffee machine is confusing! How do I make a latte?
B

B

No problem! First, if you fill the water tank, the machine lights up. Then, when the milk is hot, you add the espresso.

Quick FAQ

Q

What's the main difference between if and when in the Zero Conditional?

In the Zero Conditional, if and when are often interchangeable for general truths and facts. However, when often emphasizes that the condition is expected or happens regularly (like a routine), while if can introduce a condition that *might* occur but still leads to a guaranteed result. Both express certainty.

Q

Can I use the Zero Conditional to give instructions?

Absolutely! It's perfect for clear instructions. For example,

If you want to print, you click this icon,
or
The printer starts if you press the green button.
It makes the result of an action very clear and predictable.

Q

How does knowing the Zero Conditional help my B1 English?

It significantly improves your ability to explain how things work, describe universal laws, talk about your habits, and give precise instructions. These are all common and essential communication tasks in B1 English for discussing facts and constant truths.

Q

Is the Zero Conditional only for scientific facts?

Not at all! While it's great for scientific facts (

If you freeze water, it turns to ice
), it's also widely used for everyday habits ("If I don't eat breakfast, I get hungry fast), general observations (When people are tired, they often make mistakes"), and practical instructions.

Cultural Context

Native English speakers use the Zero Conditional constantly in daily conversation. It's a fundamental way to express how the world works, share personal routines, and give straightforward explanations. Because it deals with objective facts and established patterns, its use is generally very direct and doesn't vary much between formal and informal settings.
Whether you're reading a scientific article or chatting with a friend about their morning routine, the structure remains consistent. This predictability makes it a solid and reliable part of your B1 English grammar toolkit.

Ejemplos clave (8)

1

If you heat water to 100°C, it boils.

Cuando calientas agua a 100°C, hierve.

Condicional Cero: Verdades Generales
2

When I'm hungry, I eat something.

Cuando tengo hambre, como algo.

Condicional Cero: Verdades Generales
3

If I drink coffee too late, I can't sleep.

Si bebo café demasiado tarde, no puedo dormir.

Condicional Cero: Hábitos y Rutinas
4

When she finishes work, she usually watches a sitcom.

Cuando ella termina de trabajar, normalmente ve una comedia.

Condicional Cero: Hábitos y Rutinas
5

If you press `Ctrl + S`, the document saves.

Si presionas `Ctrl + S`, el documento se guarda.

Condicional Cero: Hechos e Instrucciones
6

When you don't get enough sleep, you feel tired.

Cuando no duermes lo suficiente, te sientes cansado.

Condicional Cero: Hechos e Instrucciones
7

If you heat water to 100 degrees Celsius, it boils.

Si calientas agua a 100 grados Celsius, hierve.

Condicional Cero: Verdades Generales (If vs. When)
8

When the sun goes down, it gets dark.

Cuando el sol se pone, oscurece.

Condicional Cero: Verdades Generales (If vs. When)

Consejos y trucos (4)

💡

Piensa: 'Siempre es verdad'

Si el resultado siempre, siempre ocurre cuando se cumple una condición, ¡entonces estás en el Condicional Cero! Imagina que explicas una ley física:
If you freeze water, it turns to ice.
Es tu opción ideal para hechos y hábitos constantes.
frontend.learn_grammar.from_rule: Condicional Cero: Verdades Generales
💡

Piensa 'Siempre es Verdad' para TI

Al crear oraciones de Condicional Cero para hábitos, pregúntate: '¿Esto es siempre verdad para mí o para la persona de la que hablo?' Si la respuesta es sí, ¡usa el presente simple en ambas cláusulas!
If I feel tired, I drink coffee.
frontend.learn_grammar.from_rule: Condicional Cero: Hábitos y Rutinas
💡

Piensa en 'Siempre Verdadero'

El Condicional Cero es para afirmaciones que son siempre, universalmente ciertas, como hechos científicos o consecuencias innegables. Si hay un 'tal vez', no es Condicional Cero.
If you drop an apple, it falls.
frontend.learn_grammar.from_rule: Condicional Cero: Hechos e Instrucciones
💡

Piensa 'Siempre Verdadero'

Antes de usar el Cero Condicional, pregúntate: ¿esto es *siempre* cierto? Si hay un 'podría' o 'quizás', probablemente es otro condicional. ¡Mantente en los hechos!
If you mix blue and yellow, you get green.
frontend.learn_grammar.from_rule: Condicional Cero: Verdades Generales (If vs. When)

Vocabulario clave (5)

condition a state or requirement inevitable certain to happen routine a sequence of actions regularly followed instruction detailed information telling how to do something possibility a thing that may happen

Real-World Preview

thermometer

Explaining a natural phenomenon

Review Summary

  • If + Present Simple, Present Simple
  • If + Present Simple, Present Simple
  • If + Present Simple, Imperative
  • If/When + Present Simple, Present Simple
  • Zero (Fact) vs First (Possibility)

Errores comunes

Do not use 'will' in the 'if' clause of a zero conditional. Keep both parts in the present simple.

Wrong: If I will go to the park, I feel happy.
Correcto: If I go to the park, I feel happy.

When giving instructions, use the imperative form (verb base), not the gerund.

Wrong: If you are cold, putting on a coat.
Correcto: If you are cold, put on a coat.

This refers to a specific future event, so the first conditional is required.

Wrong: If it rains tomorrow, the grass is wet.
Correcto: If it rains tomorrow, the grass will be wet.

Next Steps

You have mastered the language of truth. Keep practicing!

Write 5 facts about your favorite hobby.

Continue to: Planning for Real Future Possibilities

Práctica rápida (10)

Elige la forma correcta del verbo para completar la frase en Condicional Cero.

If you ___ (mix) red and blue, you get purple.

✓ Correct! ✗ Not quite. Correct answer: mix
Ambas cláusulas en el Condicional Cero usan el tiempo Presente Simple. 'Mix' es la forma correcta del Presente Simple.

frontend.learn_grammar.from_rule: Condicional Cero: Verdades Generales

Encuentra y corrige el error en la oración.

Find and fix the mistake:

If I will study hard, I will pass the exam.

✓ Correct! ✗ Not quite. Correct answer: If I study hard, I will pass the exam.
En el Primer Condicional, la cláusula 'if' siempre usa el presente simple, incluso cuando se refiere a una posibilidad futura. 'Will' solo debe ir en la cláusula principal. ¡Un error común que ya no cometerás!

frontend.learn_grammar.from_rule: Condicional Cero vs Primero: Diferencia Clave

¿Qué frase usa correctamente el Condicional Cero?

Elige la frase correcta:

✓ Correct! ✗ Not quite. Correct answer: If you touch fire, you burn yourself.
El Condicional Cero usa el Presente Simple tanto en la cláusula 'if' como en la cláusula principal para verdades universales.

frontend.learn_grammar.from_rule: Condicional Cero: Verdades Generales

Encuentra y corrige el error en la oración.

Find and fix the mistake:

When it rains, the roads will get slippery.

✓ Correct! ✗ Not quite. Correct answer: When it rains, the roads get slippery.
El Cero Condicional describe cosas que siempre son verdad. Por lo tanto, 'will get' debería ser 'get' (presente simple) para reflejar esta certeza, no una predicción futura.

frontend.learn_grammar.from_rule: Condicional Cero: Verdades Generales (If vs. When)

Encuentra y corrige el error en la siguiente frase con Condicional Cero.

When it rains, the roads will get slippery.

✓ Correct! ✗ Not quite. Correct answer: When it rains, the roads get slippery.
El Condicional Cero requiere el Presente Simple en ambas cláusulas, indicando una verdad universal. 'Will get' debería ser 'get'.

frontend.learn_grammar.from_rule: Condicional Cero: Verdades Generales

Encuentra y corrige el error en la oración.

Find and fix the mistake:

When she will travel, she always buys souvenirs.

✓ Correct! ✗ Not quite. Correct answer: When she travels, she always buys souvenirs.
El Condicional Cero usa el presente simple en ambas cláusulas, la 'when' y la principal, para hábitos regulares. 'Will' es incorrecto aquí.

frontend.learn_grammar.from_rule: Condicional Cero: Hábitos y Rutinas

Elige la forma correcta para completar la oración.

If you don't study, you ___ your exams.

✓ Correct! ✗ Not quite. Correct answer: fail
Para verdades generales en el Cero Condicional, ambas cláusulas usan el presente simple. 'Fail' es la forma correcta del presente simple.

frontend.learn_grammar.from_rule: Condicional Cero: Verdades Generales (If vs. When)

¿Qué oración usa correctamente el condicional?

Elige la oración correcta:

✓ Correct! ✗ Not quite. Correct answer: If it rains, we will stay inside.
La primera opción usa correctamente el Primer Condicional para una posibilidad futura: 'if' + presente simple en la condición, 'will' + verbo base en el resultado. La tercera opción implicaría que siempre nos quedamos dentro si llueve, no solo un plan para una lluvia específica. ¡Así se hace un plan!

frontend.learn_grammar.from_rule: Condicional Cero vs Primero: Diferencia Clave

¿Cuál oración establece correctamente una regla o un hecho?

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: When I study hard, I pass.
Esta oración usa correctamente el presente simple en ambas cláusulas para describir un resultado consistente de un hábito o una verdad general, alineándose con el Condicional Cero.

frontend.learn_grammar.from_rule: Condicional Cero: Hechos e Instrucciones

Elige la forma correcta para completar la instrucción.

If the kettle ___, it means the water is boiling.

✓ Correct! ✗ Not quite. Correct answer: whistles
Para el Condicional Cero, ambas cláusulas usan el tiempo presente simple, describiendo un hecho siempre verdadero. El sujeto 'kettle' es singular, por lo que el verbo lleva una '-s'.

frontend.learn_grammar.from_rule: Condicional Cero: Hechos e Instrucciones

Score: /10

Preguntas frecuentes (6)

El Condicional Cero lo usas para hablar de verdades generales, hechos científicos, hábitos o instrucciones; cosas que siempre son ciertas y cuyo resultado es predecible. Por ejemplo, si un chef te da una indicación:
If you heat water, it boils.
.
Lo formas usando el Presente Simple en ambas partes: If/When + Presente Simple, Presente Simple. Imagina que hablas de tu reacción a algo:
When I eat too much, I feel sick.
.
Se usa para hablar de cosas que son *siempre verdaderas* o que ocurren *regularmente* para una persona o grupo específico. Piensa en ello como explicar los patrones predecibles de alguien, como 'If I get stressed, I go for a walk.'
Usas el presente simple en ambas cláusulas, la 'if' (o 'when') y la principal. La estructura es 'If/When + Sujeto + Presente Simple, Sujeto + Presente Simple.'
El Condicional Cero se usa para cosas que son siempre verdad, como hechos científicos, verdades universales o hábitos generales. Describe una causa que consistentemente lleva a un efecto específico:
If you heat ice, it melts.
Lo formas con 'if' o 'when' seguido del present simple en la cláusula de condición, y el present simple de nuevo en la cláusula de resultado. Por ejemplo:
If it rains, the ground gets wet.
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