Condicional Cero: Hechos e Instrucciones
verdades universales y dar instrucciones claras. ¡Siempre funciona igual!
Grammar Rule in 30 Seconds
The Zero Conditional expresses facts, scientific laws, and habits that are always true when a specific condition is met.
- Use Present Simple in both clauses: 'If you heat ice, it melts.'
- Use 'when' instead of 'if' for things that happen regularly: 'When it rains, the grass gets wet.'
- Use a comma only if the 'if' clause comes first: 'If it rains, I stay home.'
Overview
Zero Conditional es, sin duda, uno de los pilares fundamentales para comunicarte con claridad en inglés. Si ya te sientes cómodo con el present simple, te darás cuenta de que este condicional es tu mejor aliado para sonar preciso y profesional. ¿Por qué es tan importante?Zero Conditional es una bendición gramatical. ¿Sabes por qué? Porque su estructura es prácticamente idéntica a la que usamos en español.Si calientas el hielo, se derrite, estamos usando exactamente la misma lógica que el inglés requiere. No hay cambios extraños de tiempo verbal ni conjugaciones complejas en el modo subjuntivo que tanto nos complica a veces en otros condicionales. Es una estructura directa, honesta y extremadamente útil para el nivel B1, donde ya necesitas empezar a conectar ideas de forma más estructurada.
Zero Conditional es la certeza absoluta. A diferencia del primer condicional (que habla de cosas que probablemente pasarán) o del segundo (que es puramente imaginario), el condicional cero se mueve en el terreno de lo que no cambia. Es atemporal.Si llueve, el suelo se moja. En inglés, hacemos exactamente lo mismo usando el
present simple en ambas partes de la frase. Esta simetría es lo que le da su nombre de cero, porque la distancia temporal entre la condición y el resultado es inexistente; el resultado es automático.If A happens, B happens. No hay espacio para la duda. Por eso es el tiempo verbal preferido para los manuales de instrucciones y las definiciones científicas.if (si) por when (cuando) sin que el significado cambie drásticamente. Esto sucede porque, al ser una verdad universal, sabemos que la condición se cumplirá tarde o temprano o que, cada vez que se cumpla, el resultado será el mismo. Por ejemplo:If you press the button, the light turns on.(Si presionas el botón, la luz se enciende).When you press the button, the light turns on.(Cuando presionas el botón, la luz se enciende).
regla suele coincidir perfectamente con el uso del Zero Conditional en inglés. La clave aquí es resistir la tentación de querer usar tiempos futuros, algo que veremos más adelante en la sección de errores comunes.Zero Conditional es una de las más sencillas de recordar porque es simétrica. Se compone de dos cláusulas (partes de la frase): la cláusula de la condición (la que empieza con if) y la cláusula del resultado.if clause) | Cláusula de Resultado (main clause) |If / When + sujeto + present simple | sujeto + present simple |If you heat ice, it melts.(Si calientas hielo, se derrite).When it rains, the grass gets wet.(Cuando llueve, la hierba se moja).If I don't sleep, I feel tired.(Si no duermo, me siento cansado).
- 1Condición primero: Si empiezas con
ifowhen, debes poner una coma antes de la segunda parte.
If you freeze water, it becomes solid.
- 1Resultado primero: Si empiezas con el resultado, no se pone coma.
Water becomes solid if you freeze it.
present simple de la cláusula de resultado por un imperativo (una orden directa).If you are tired, go to bed.(Si estás cansado, ve a la cama).When the phone rings, don't answer it.(Cuando el teléfono suene, no lo respondas).
Unlessa menos que. En inglés, tenemos la palabra unless, que funciona como un if not. Es muy elegante y te hará sonar más avanzado.Unless you water plants, they die.(A menos que riegues las plantas, se mueren).- Esto es lo mismo que decir:
If you don't water plants, they die.
-s de la tercera persona (he, she, it) en el present simple. Como usamos este tiempo en ambas partes de la frase, es muy común que nos olvidemos de decir If he eats peanuts, he gets sick. ¡Esa s es la marca de un estudiante de nivel B1 que realmente domina la gramática!Zero Conditional? Aquí tienes los escenarios más comunes donde brilla esta estructura:If you mix red and blue, you get purple.(Si mezclas rojo y azul, obtienes morado).When the sun goes down, it gets dark.(Cuando el sol se pone, se oscurece).If you heat water to 100 degrees, it boils.(Si calientas agua a 100 grados, hierve).
manual de usuario personal.If I drink coffee at night, I don't sleep well.(Si bebo café por la noche, no duermo bien).When I'm stressed, I listen to music.(Cuando estoy estresado, escucho música).If my team loses, I feel sad for the rest of the day.(Si mi equipo pierde, me siento triste el resto del día).
If the light is red, you must stop.(Si la luz está roja, debes parar).When you arrive at the hotel, ask for Mr. Smith.(Cuando llegues al hotel, pregunta por el Sr. Smith).If you want to save the document, press Ctrl+S.(Si quieres guardar el documento, presiona Ctrl+S).
If the boss is happy, the meeting is short.(Si el jefe está feliz, la reunión es corta).When there is a lot of traffic, I am late for work.(Cuando hay mucho tráfico, llego tarde al trabajo).
will (El error más común)Si llueve, me mojaré. Ese
mojaré es futuro. Por eso, muchos estudiantes dicen: If it rains, I will get wet.Zero Conditional: If it rains, I get wet.will, estás pasando al First Conditional, que se usa para una situación específica en el futuro.- Incorrecto:
If you heat ice, it will melt.(Suena como si estuvieras prediciendo el futuro de un trozo de hielo específico). - Correcto:
If you heat ice, it melts.(Es una ley física general).
S en la tercera personapresent simple dos veces en la misma frase, las probabilidades de olvidar la s se duplican.- Incorrecto:
If she exercise, she feel better. - Correcto:
If she exercises, she feels better.
Si yo fuera..., Si tuviera...). En inglés, el Zero Conditional nunca usa subjuntivo. Siempre es el presente más simple y directo que conozcas.Si no haces nada.... Usamos
no y nada (doble negación). En inglés, esto es un error grave.- Incorrecto:
If you don't do nothing... - Correcto:
If you don't do anything...oIf you do nothing...
Zero Conditional con el First Conditional. Aunque se parecen, el matiz de significado es muy diferente. Aquí tienes una tabla comparativa para que veas la diferencia claramente:If + Present Simple, Present Simple | If + Present Simple, Will + Verb |If I eat peanuts, I die. (Soy alérgico, es un hecho médico). | If I eat this, I will be full. (Hablo de esta comida específica ahora). |If it rains, the ground gets wet. (Es una ley física). | If it rains tomorrow, I will stay home. (Es un plan para un día concreto). |¿Esto pasa siempre o solo estoy hablando de una situación específica en el futuro?.
- Si la respuesta es siempre, usa el
Zero. - Si la respuesta es esta vez, usa el
First.
can o must en el Zero Conditional?present simple, a veces usamos verbos modales en el presente para expresar capacidad o necesidad en una regla general.- Ejemplo:
If you don't have a passport, you can't travel abroad.(Es una regla general).
If o When. Es una regla de puntuación que ayuda al lector a saber dónde termina la condición y dónde empieza el resultado. Si pones el If en medio, el propio if actúa como separador y la coma ya no es necesaria.if y when en este condicional?Zero Conditional, la diferencia es mínima. If sugiere que la condición puede ocurrir o no (aunque el resultado sea seguro si ocurre), mientras que when sugiere que la condición ocurre con regularidad.If I get a headache, I take an aspirin.(A veces me duele la cabeza).When I get a headache, I take an aspirin.(Me pasa a menudo y ya sé qué hacer).
If you want to learn English, practice every day.(Es un consejo basado en una verdad universal: la práctica hace al maestro).
Zero Conditional. Recuerda que la clave está en la sencillez: no busques tiempos verbales complicados, mantente en el presente y confía en tu lógica. ¡A practicar!Zero Conditional Structure
| Clause Type | Conjunction | Subject | Verb Tense | Example |
|---|---|---|---|---|
|
Condition Clause
|
If / When
|
You
|
Present Simple
|
If you heat ice,
|
|
Result Clause
|
(None)
|
It
|
Present Simple
|
it melts.
|
|
Negative Condition
|
If
|
You
|
Present Simple (Neg)
|
If you don't eat,
|
|
Negative Result
|
(None)
|
You
|
Present Simple (Neg)
|
you don't grow.
|
|
Question Form
|
If
|
You
|
Present Simple
|
Do you get sick if you eat nuts?
|
Common Contractions in Zero Conditional
| Full Form | Contraction | Usage Example |
|---|---|---|
|
do not
|
don't
|
If you don't study, you fail.
|
|
does not
|
doesn't
|
If it doesn't rain, plants die.
|
|
I am
|
I'm
|
If I'm late, I call.
|
|
it is
|
it's
|
If it's hot, I swim.
|
Meanings
A grammatical structure used to talk about general truths, scientific facts, or things that are always certain to happen under specific conditions.
Scientific Facts
Describing laws of nature or scientific certainties.
“If water reaches 100 degrees, it boils.”
“If you freeze water, it becomes a solid.”
Habits and Routines
Describing personal rules or automatic reactions to situations.
“If I wake up late, I miss the bus.”
“When I'm tired, I drink coffee.”
Instructions and Commands
Giving orders or advice based on a specific condition.
“If the alarm rings, leave the building immediately.”
“Call me if you need help.”
Reference Table
| Condición (cláusula If/When) | Resultado (cláusula principal) | Tipo de Afirmación |
|---|---|---|
|
If you heat metal,
|
it expands.
|
Hecho Científico
|
|
When I exercise,
|
I feel better.
|
Verdad Personal/Hábito
|
|
If the battery runs low,
|
recharge your phone.
|
Instrucción/Regla
|
|
When it's cold,
|
water freezes.
|
Fenómeno Natural
|
|
If you don't save,
|
you lose your work.
|
Consecuencia/Regla
|
|
When he gets bored,
|
he scrolls TikTok.
|
Hábito/Rutina
|
|
If you mix primary colors,
|
you create secondary colors.
|
Verdad General
|
|
When the traffic light is red,
|
you stop.
|
Regla/Instrucción
|
Espectro de formalidad
If one consumes caffeine late in the evening, sleep is often elusive. (Health advice)
If you drink coffee late at night, you don't sleep well. (Health advice)
Drink coffee late, you don't sleep. (Health advice)
Late coffee = no sleep. (Health advice)
Condicional Cero: Hechos e Instrucciones
Estructura
- If / When + Present Simple Cláusula de Condición
- Present Simple Cláusula de Resultado
- Comma Se usa si la cláusula 'If/When' va primero
Usos
- Hechos Científicos Ej., If you heat water to 100°C, it boils.
- Verdades Universales Ej., When the sun sets, it gets dark.
- Instrucciones / Reglas Ej., If you want coffee, press this button.
- Hábitos / Rutinas Ej., If I wake up early, I go for a run.
Idea Clave
- Certeza La causa siempre lleva al mismo efecto.
- Intercambiable 'If' y 'When' a menudo significan lo mismo.
Condicional Cero vs. Primer Condicional
¿Es Condicional Cero?
¿La afirmación describe algo que SIEMPRE ES VERDADERO o una instrucción que SIEMPRE produce el mismo resultado?
¿La cláusula de resultado expresa un resultado definido o un comando general?
¿Estás evitando 'will' o 'would' en ambas cláusulas (a menos que sea un modal para instrucción amable)?
Escenarios del Condicional Cero
Hechos
- • If you mix red and yellow, you get orange.
- • When you freeze water, it expands.
- • If you drop something, it falls.
Instrucciones
- • If you want to log in, enter your username.
- • When the light turns green, go.
- • If you have questions, ask a teacher.
Rutinas
- • If I feel stressed, I listen to music.
- • When my alarm rings, I wake up.
- • If they win, they celebrate loudly.
Consecuencias
- • If you don't study, you fail.
- • When it rains, the roads get slippery.
- • If you eat too much, you gain weight.
Ejemplos por nivel
If you heat ice, it melts.
If you heat ice, it melts.
If I am tired, I sleep.
If I am tired, I sleep.
If it rains, the grass is wet.
If it rains, the grass is wet.
If you are hungry, eat an apple.
If you are hungry, eat an apple.
When it rains, I stay at home.
When it rains, I stay at home.
If you don't eat, you get thin.
If you don't eat, you get thin.
Does water boil if you heat it to 100 degrees?
Does water boil if you heat it to 100 degrees?
If my mom cooks, the food is great.
If my mom cooks, the food is great.
If you mix red and white, you get pink.
If you mix red and white, you get pink.
If the phone rings, don't answer it.
If the phone rings, don't answer it.
Plants die if they don't get enough sunlight.
Plants die if they don't get enough sunlight.
If you travel by bus, it takes much longer.
If you travel by bus, it takes much longer.
If a substance is denser than water, it sinks.
If a substance is denser than water, it sinks.
Whenever the economy slows down, unemployment rises.
Whenever the economy slows down, unemployment rises.
If you exercise regularly, your heart rate decreases.
If you exercise regularly, your heart rate decreases.
If the software crashes, the unsaved data is lost.
If the software crashes, the unsaved data is lost.
If the temperature drops below zero, the pipes are at risk of bursting.
If the temperature drops below zero, the pipes are at risk of bursting.
If one lacks discipline, success remains elusive.
If one lacks discipline, success remains elusive.
If the court finds the defendant guilty, a sentence is passed immediately.
If the court finds the defendant guilty, a sentence is passed immediately.
If a language is not spoken, it eventually becomes extinct.
If a language is not spoken, it eventually becomes extinct.
If the fundamental laws of physics are constant, then entropy invariably increases.
If the fundamental laws of physics are constant, then entropy invariably increases.
If a society neglects its youth, it sows the seeds of its own destruction.
If a society neglects its youth, it sows the seeds of its own destruction.
If the narrative lacks a coherent structure, the reader's engagement diminishes.
If the narrative lacks a coherent structure, the reader's engagement diminishes.
If an organism fails to adapt to its environment, it faces inevitable extinction.
If an organism fails to adapt to its environment, it faces inevitable extinction.
Fácil de confundir
Learners use 'will' in the zero conditional because they think the result is in the future.
Learners aren't sure which one to use in zero conditionals.
Learners try to use 'you should' or 'you must' instead of a simple imperative in instructions.
Errores comunes
If you heat ice, it will melt.
If you heat ice, it melts.
If it rain, the grass gets wet.
If it rains, the grass gets wet.
If I am hungry I eat.
If I am hungry, I eat.
If you not eat, you die.
If you don't eat, you die.
When it will rain, I stay home.
When it rains, I stay home.
If I wake up late, I'm missing the bus.
If I wake up late, I miss the bus.
If you mix oil and water, they are separating.
If you mix oil and water, they separate.
If you would heat ice, it melts.
If you heat ice, it melts.
If the alarm rings, you will leave.
If the alarm rings, leave.
If you don't have a ticket, you aren't entering.
If you don't have a ticket, you don't enter.
If the data will be corrupted, the system fails.
If the data is corrupted, the system fails.
Patrones de oraciones
If you ___, you ___.
When it ___, I ___.
If the ___ ___, the ___ ___.
___ ___ if ___ ___.
Real World Usage
If the sauce thickens too much, add a splash of water.
If the screen stays black, hold the power button for ten seconds.
If you drop the weights, you lose your membership.
If the catalyst is added, the reaction rate doubles.
If you don't clean your room, you don't get dessert.
If you work on a holiday, you get double pay.
Piensa en 'Siempre Verdadero'
If you drop an apple, it falls.
Evita 'Will' y 'Would'
If it rains, we stay home.(No 'will stay').
'If' y 'When' son Amigos
When you heat ice, it melts.o
If you heat ice, it melts.
Instrucciones Amables
If you need help, please ask.
Revisa la Coma
If you study, you learn.pero
You learn if you study.
Identifica los Imperativos
If the light is red, stop.Esto sigue siendo Condicional Cero.
If you see smoke, call the fire department.
Smart Tips
Check that both verbs are in the Present Simple. Do not use 'will'.
Try swapping them. If the meaning stays the same, you are looking at a Zero Conditional.
Use the imperative in the second clause for a clearer, more professional tone.
Look for the 'If'. If it's at the start, put a comma in the middle. If it's in the middle, remove all commas.
Pronunciación
The 'If' Clause Lift
In the first part of the sentence (the condition), your voice usually goes up in pitch at the end of the clause to show the sentence isn't finished.
The Result Clause Fall
The second part of the sentence (the result) ends with a falling intonation to signal the end of the statement.
Rising-Falling
If it rains [rising], the grass gets wet [falling].
Standard declarative conditional statement.
Memorízalo
Mnemotecnia
FACTS: Frequently Always Constant True Situations. If it's a FACT, use the Zero Conditional.
Asociación visual
Imagine a light switch. If you flip the switch (Condition), the light turns on (Result). It happens every single time, without fail. This is the Zero Conditional.
Rhyme
If the fact is always true, Present Simple is for you!
Story
A scientist in a lab always follows rules. If he mixes A and B, it explodes. If he leaves the door open, the mice escape. His life is a series of Zero Conditionals because everything is a predictable result of an action.
Word Web
Desafío
Look around your room. Find three things that always happen. (e.g., 'If I press this button, the TV turns on.') Write them down using the Zero Conditional.
Notas culturales
British speakers frequently use the zero conditional to talk about the weather and social etiquette. 'If it's sunny, everyone goes to the park.'
In academic and scientific writing, the zero conditional is the standard for defining laws and repeatable results.
Americans often use the zero conditional for 'tough love' advice or stating blunt facts of life.
The word 'if' comes from the Old English 'gif', which has Germanic roots. The structure of using present tenses for universal truths has been a stable feature of English for centuries.
Inicios de conversación
What happens if you don't drink water for a whole day?
If you have a free weekend, what do you usually do?
How does your body react if you are very stressed?
In your country, what happens if someone breaks a minor law?
Temas para diario
Errores comunes
Test Yourself
If the kettle ___, it means the water is boiling.
Find and fix the mistake:
If you will drop glass, it will break.
Choose the correct sentence:
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Score: /4
Ejercicios de practica
8 exercisesIf you ___ (mix) hydrogen and oxygen, you ___ (get) water.
Select the correct sentence:
Find and fix the mistake:
If she don't study, she fails her exams.
If you freeze water, it becomes ice.
You can use 'when' instead of 'if' in the Zero Conditional without changing the meaning.
A: Why is the grass so dry? B: Well, if it ___ (not rain), the grass ___ (die).
Identify the incorrect usage:
1. If you touch fire... 2. If you don't sleep... 3. If you add sugar...
Score: /8
Practice Bank
12 exercisesWhen the temperature ___ below zero, water freezes.
If you will mix blue and yellow, you will get green.
Which sentence is correct?
Translate into English: 'Si hace calor, la gente suda.'
Arrange these words into a sentence:
Match the conditions with the correct results:
If you ___ the red button, the alarm sounds.
When he is late, he will usually call.
Which sentence is correct?
Arrange these words into a sentence:
Match the beginning of the instruction with its correct completion:
Score: /12
Preguntas frecuentes (8)
No. If you use `will`, it becomes a First Conditional, which is for specific future events, not general truths.
They are mostly interchangeable. `When` suggests the condition happens more frequently or certainly than `if`.
Only if the `if` clause comes first. If the result clause is first, no comma is used.
Yes, but you must use the Past Simple in both clauses. 'If it rained, we played inside.' This is called the Past Real Conditional.
It is neutral. It is used in both very formal scientific papers and very informal daily speech.
Yes! This is very common for instructions. 'If you are tired, go to bed.'
Because there is 'zero' doubt about the result. It is a 100% certainty.
Yes. `Unless` means `if not`. 'Plants die unless they get water.'
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Si + presente + presente
Spanish speakers rarely make the mistake of adding 'will' (hará) in this context.
Si + présent + présent
French speakers might use 'quand' (when) more frequently than 'si'.
Wenn + Präsens + Präsens
The verb moves to the end of the 'wenn' clause in German, unlike English.
Verb-ru + to (~と)
Japanese has several conditional forms (~ba, ~tara), but 'to' is the closest to the Zero Conditional.
Idha (إذا) + Present
Arabic can also use the past tense after 'Idha' to express a condition, which confuses learners.
Ruguo (如果) ... jiu (就) ...
The lack of tense markers in Chinese makes the 'Present Simple' concept abstract for learners.
Learning Path
Prerequisites
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