¿Mustn’t o don’t have to? Inglés B1 para pedir una excepción a una norma sobre el móvil

Para pedir una excepción en inglés, acepta la norma, da una razón concreta y propón una alternativa limitada con condiciones: “I understand the rule, but I must be reachable tonight. Could reception keep my phone?” Detrás hay cuatro significados: have to y must (necesario), mustn’t (prohibido), don’t have to (no necesario) y, para aconsejar, should y ought to. Si confundes las dos formas negativas, una prohibición se convierte en una opción libre. Es un tema de nivel B1 (intermedio) para adultos que conocen estas formas pero dudan al elegir entre ellas.

¿Para quién es este artículo?

Adultos de nivel intermedio que conocen must y have to pero no tienen claro por qué mustn’t y don’t have to significan cosas tan distintas.
Personas que necesitan pedir flexibilidad en inglés, en un local, en el trabajo, en un colegio o en un hospital, y quieren sonar razonables, no exigentes.
Cuidadores, padres y trabajadores de guardia que a veces tienen que estar localizables y necesitan explicar por qué sin contar detalles privados.
Demasiado pronto: si todavía dices “I must to go” o aún no sabes formar “Do you have to…?”, practica primero normas y opciones sencillas de nivel A2; este artículo da por hecho que sabes formar todos estos verbos.
Demasiado fácil: si ya eliges estos significados sin pensar y negocias con soltura, pasa al B2 y argumenta a favor y en contra de los cursos de aventura en el trabajo.

Abrir las páginas de muestra

Tarjetas de vocabulario

have to / has to + base verb

an external rule or practical necessity; questions use do or does

Audience members have to keep devices silent. Does Owen have to surrender his phone?

must + base verb

a strong obligation often stated by the speaker or authority; no to after must

Maya says, ‘We must protect the audience from interruptions.’

mustn't + base verb

a prohibition: doing the action is not allowed

Guests mustn't answer calls inside the auditorium.

don't / doesn't have to + base verb

absence of necessity: the action is optional, not forbidden

Owen doesn't have to switch the phone off if it stays with reception.

should / shouldn't + base verb

a good or bad idea; softer than a rule

He should tell Maya why the call matters, but he shouldn't share private medical details.

ought to / ought not to + base verb

advice or a view about appropriate behaviour; similar to should

The centre ought to offer a safe exception for genuine emergencies.

past and future necessity

Must has no normal past form; use had to for past necessity and will have to for future necessity.

Last month Maya had to stop a screening. Tonight she will have to brief the door team.

dial a number

enter the digits needed to start a call

Owen dialled the care home's number from the quiet lobby.

text / message someone

send someone a written phone message

Maya messaged the technician to say the screening might start late.

hang up

end a phone call; hang up on someone means end it abruptly

Owen said goodbye before he hung up, so the nurse knew the call was finished.

call back

return a call after missing it or ending it temporarily

The nurse asked Owen to call back after nine.

leave a message on voicemail

record a spoken message when the person does not answer

He left a message on his sister's voicemail explaining the situation.

choose a ringtone

select the sound a phone makes for an incoming call

Maya chose a quiet ringtone for work calls.

swipe through photos

move from one phone image to another by sliding a finger

A guest swiped through photos while waiting for the doors to open.

make a call / make calls

use a phone to speak to someone

Owen makes most family calls in the evening, when the care-home staff have time to talk.

Conversación

maya Before you go in, you have to leave your phone in the secure box. We had two complaints after last week's screening.

owen I understand the rule, but the care home may call about my father tonight. I must be reachable.

maya You mustn't take a call inside, and the phone shouldn't even vibrate near the seats.

owen Could reception keep it? You don't have to interrupt the film. Someone could quietly come and get me.

maya That could work. You ought to give reception your seat number and the caller's number.

owen Fine. I'll switch off every other notification, and I won't swipe through messages during the film.

maya Then you don't have to miss the screening. I'll tell the duty manager why we made the exception.

Estructura de la frase

Do I have to leave my phone in the box?

Normally, yes. You mustn't use it in the auditorium, but reception can hold it and alert you quietly.

Acknowledge the shared purpose before requesting a limited, practical exception.

I understand the rule.
Could we make an exception?
That seems reasonable.

Aprende esta unidad

¿Cómo quieres aprender?

¿Ya tienes cuenta?

Una cuenta gratis abre una unidad para siempre.

¿Necesario, prohibido, no necesario o buena idea?

Todas estas formas van seguidas de la forma base del verbo; solo have to y ought to llevan to. Tener que se parece mucho a have to, y no tener que a don’t have to, así que apóyate en esa pareja. Deber, en cambio, sirve para obligación y para consejo: decide si es una norma (must) o un consejo (should).

Necesario, a menudo por una norma externa: have to. “Audience members have to keep devices silent.” Las preguntas usan do: “Do I have to leave my phone in the box?”
Necesario, a menudo según quien habla: must. “I must be reachable tonight.”
Prohibido: mustn’t. “Guests mustn’t answer calls inside the auditorium.”
No necesario, así que eliges tú: don’t have to. “You don’t have to switch your phone off if reception keeps it.”
Consejo, más suave que una norma: should, shouldn’t, ought to. “You ought to give reception your seat number.”

Mustn’t o don’t have to: la pareja que da la vuelta al significado

En negativa, must y have to se separan: mustn’t es una prohibición, don’t have to quita la necesidad y shouldn’t es solo una mala idea. Ojo con “no debes”: puede ser mustn’t (está prohibido) o shouldn’t (no es buena idea). En mustn’t, la primera t no se pronuncia.

“You shouldn’t take a call there.” Una mala idea.
“You mustn’t take a call there.” No está permitido.
“You don’t have to take a call there.” No es necesario.

Pedir una excepción limitada en cuatro pasos

Una petición suena razonable cuando protege el propósito de la norma. Da una razón concreta, pero sin detalles privados.

Acepta la norma: “I understand the rule.”
Da una razón: “The care home may call about my father tonight.”
Propón una alternativa limitada: “Could we make an exception? Could reception keep my phone?”
Ofrece condiciones: “I’ll switch off every other notification, and I won’t check messages during the film.”

Escucha: estar localizable durante una película

En un centro cultural, los móviles se dejan en una caja con llave antes de la proyección, pero un espectador espera una llamada de la residencia donde vive su padre. Escucha la norma, la necesidad y las dos condiciones.

Maya Before you go in, you have to leave your phone in the secure box. We had two complaints after last week's screening.

Owen I understand the rule, but the care home may call about my father tonight. I must be reachable.

Maya You mustn't take a call inside, and the phone shouldn't even vibrate near the seats.

Owen Could reception keep it? You don't have to interrupt the film. Someone could quietly come and get me.

Maya That could work. You ought to give reception your seat number and the caller's number.

Owen Fine. I'll switch off every other notification, and I won't swipe through messages during the film.

Frases de teléfono para llamadas importantes

Apréndelas como frases completas.

Call back (devolver la llamada): “The nurse asked him to call back after nine.”
Cuando algo falla: “I tried twice, but the line was engaged.” “They put me on hold.” “We were cut off.” En inglés americano se dice busy, no engaged.
Go off (sonar de repente): “A phone went off during the welcome speech.”

Aprende esta unidad a tu manera

Errores frecuentes

Revisa estos:

“You don’t have to use your phone inside” para una prohibición. Di “You mustn’t use your phone inside.”
“I must to leave early.” Después de must no va to: “I must leave early.” Pero ought sí lo lleva: “You ought to give them your number.”
“Did you must wait?” Must no tiene pasado: “Did you have to wait?”
“I need my phone” suena a exigencia. Empieza con “I understand the rule, but…”

Debate: ¿cuándo debería flexibilizarse una norma?

Responde en voz alta dos minutos a cada pregunta, con una razón y un ejemplo: “I think there ought to be…”, “People mustn’t…, but…”, “You don’t have to…, unless…”.

“Should cinemas and restaurants make their own phone rules, or should people decide for themselves?”
“Is it fair for an employer to ban phones in meetings? Who should get an exception?”

Práctica diaria de 10 minutos

Di todo en voz alta.

2 minutos: escucha la conversación y clasifica cada verbo: necesario, prohibido, no necesario o consejo.
3 minutos: tres normas reales de tu vida, con have to, mustn’t y don’t have to.
3 minutos: representa una nueva excepción, para una enfermera de guardia en un concierto, en cuatro pasos.
2 minutos: escribe dos condiciones, con ought to y con I won’t.

Siguiente paso

En B1, usa este mismo tono cuidadoso para explicar un estudio pequeño sin exagerar, describir una amistad que ha cambiado o informar de un cobro duplicado. En B2, argumenta a favor y en contra de los cursos de aventura en el trabajo.

Preguntas frecuentes

¿Qué diferencia hay entre mustn’t y don’t have to?

Mustn’t significa que no está permitido: “You mustn’t take a call inside.” Don’t have to significa que no es necesario: “You don’t have to miss the screening.”

¿Cuál es el pasado de must?

Para obligación, must no tiene pasado: se usa had to. “We had to leave our phones at the door.” Para el futuro, will have to.

¿Cómo se pide con educación una excepción a una norma en inglés?

Acepta la norma, da una razón, propón una alternativa y ofrece una condición: “I know phones aren’t allowed inside, but could I leave mine at reception? I won’t check messages.”