Pasiva con Modales: Haciendo que las cosas se hagan
Grammar Rule in 30 Seconds
Use modal passives to focus on the action's necessity or possibility without needing to mention who is performing it.
- Present/Future: Use 'Modal + be + Past Participle' (e.g., 'It must be finished').
- Past: Use 'Modal + have been + Past Participle' (e.g., 'It should have been done').
- Negative: Place 'not' after the modal (e.g., 'It cannot be changed').
Overview
Someone must submit the report by Friday (Alguien debe entregar el informe para el viernes), lo cual pone el foco en una persona indeterminada, la pasiva con modales te permite decir The report must be submitted by Friday. Aquí, el énfasis recae enteramente sobre la acción y el informe en sí, lo cual suena mucho más profesional y directo en cuanto a la obligación.to). En la construcción pasiva, esta forma base invariablemente es el verbo be, sin importar el sujeto de la oración.must is, can are, o should was. El verbo auxiliar be permanece en su forma más pura y sin conjugar.Someone should write the proposal (Alguien debería escribir la propuesta), la acción de escribir se atribuye a un 'alguien' no especificado. Al convertirla a la pasiva, The proposal should be written, el foco se desplaza completamente a la proposal y la necesidad de su creación.someone) simplemente se omite porque no es relevante. Si por alguna razón fuera importante mencionar quién debe realizar la acción, se puede introducir mediante la preposición by, como en The proposal should be written by the end of the week. El participio pasado del verbo principal (written en este caso) siempre denota la acción completada que afecta al sujeto.It is possible for people to solve this problem, puedes afirmar de manera concisa: This problem can be solved. La voz pasiva inherente a esta estructura despersonaliza la acción, lo cual la hace perfecta para la redacción científica, las declaraciones de políticas o cualquier contexto donde el proceso o el resultado sean más importantes que la persona que los ejecuta.Sujeto + Verbo Modal + be + Participio Pasado (V3)can, could, may, might, must, should, will, would) expresa el grado de certeza, obligación o posibilidad. Lo más importante que debes recordar es que el auxiliar be siempre sigue al modal en su forma base.-ed para los regulares) es la forma del verbo principal que indica la acción completada (ej. written, taken, given).not justo después del verbo modal:Sujeto + Verbo Modal + not + be + Participio Pasado (V3)The application cannot be processed without all documents.This information should not be shared externally.
Verbo Modal + Sujeto + be + Participio Pasado (V3)?Can the changes be implemented by next week?Should the new policy be announced tomorrow?
- 1Cuando el agente es desconocido o poco importante: Esta es la razón más común. Si no sabes quién realizó la acción, o si identificar a la persona no es relevante para el tema, la voz pasiva te permite discutir la acción en sí. Es el equivalente inglés de nuestro 'se impersonal'.
The website must be updated regularly.(Se sobreentiende que *alguien* lo actualiza, pero el enfoque está en la necesidad del sitio web).My keys could be left in the office.(El hablante no sabe quién podría haberlas dejado, o si fueron dejadas allí intencionadamente).
- 1Para enfatizar la acción o su receptor: Al colocar al receptor de la acción en la posición del sujeto, resaltas lo que le sucedió a él en lugar de quién lo causó. Es como cuando en español decimos
Modal Passive Formation
| Timeframe | Modal | Auxiliary | Verb Form | Example |
|---|---|---|---|---|
|
Present/Future
|
can/must/should
|
be
|
Past Participle (V3)
|
It can be done.
|
|
Past
|
could/should/must
|
have been
|
Past Participle (V3)
|
It should have been done.
|
|
Negative (Pres)
|
cannot/must not
|
be
|
Past Participle (V3)
|
It must not be done.
|
|
Negative (Past)
|
might not
|
have been
|
Past Participle (V3)
|
It might not have been done.
|
|
Question
|
Should
|
Subject + be
|
Past Participle (V3)
|
Should it be done?
|
Common Contractions
| Full Form | Contracted Form | Usage Note |
|---|---|---|
|
cannot be
|
can't be
|
Very common in speech
|
|
should not be
|
shouldn't be
|
Common in advice
|
|
must not be
|
mustn't be
|
Common in British English
|
|
should have been
|
should've been
|
Spoken English only
|
Meanings
The modal passive is used to express necessity, possibility, permission, or obligation regarding an action where the receiver of the action is the subject.
Obligation and Necessity
Expressing that an action is required to be performed on an object.
“Safety goggles must be worn at all times in the lab.”
“The taxes should be paid by the end of the month.”
Possibility and Ability
Expressing what can or could happen to an object.
“The problem could be solved with more funding.”
“This software can be downloaded for free.”
Past Regret or Deduction
Reflecting on actions that were or weren't performed in the past.
“The mistake should have been caught during the review.”
“The package must have been delivered to the wrong address.”
Reference Table
| Modal | Significado | Ejemplo Activo | Ejemplo Pasivo |
|---|---|---|---|
|
can
|
Habilidad/Posibilidad
|
They can solve the problem.
|
The problem can be solved.
|
|
could
|
Posibilidad/Sugerencia
|
We could reschedule the meeting.
|
The meeting could be rescheduled.
|
|
may
|
Permiso/Posibilidad
|
You may use this tool.
|
This tool may be used.
|
|
might
|
Ligera Posibilidad
|
She might send the email.
|
The email might be sent.
|
|
must
|
Obligación/Necesidad
|
Students must read the book.
|
The book must be read.
|
|
should
|
Consejo/Recomendación
|
You should review the report.
|
The report should be reviewed.
|
|
will
|
Certeza Futura (pasiva)
|
They will complete the task.
|
The task will be completed.
|
|
would
|
Resultado Hipotético
|
Someone would enjoy this.
|
This would be enjoyed.
|
Espectro de formalidad
The report must be finalized by the close of business. (Workplace deadline)
The report should be finished soon. (Workplace deadline)
The report's gotta be done. (Workplace deadline)
This doc needs to be wrapped up ASAP. (Workplace deadline)
Voz Pasiva con Modales: El Concepto Central
Elementos Clave
- Verbo Modal Can, Should, Must, etc.
- be Always 'be'
- Participio Pasado V3 form
Propósito Principal
- Enfoque en la Acción Not the doer
- Agente Desconocido Or unimportant
- Cortesía Indirect requests/suggestions
Contextos de Uso
- Instrucciones Rules, procedures
- Posibilidades Future outcomes
- Consejos Recommendations
Activa vs. Pasiva con Modales
¿Debo usar la Voz Pasiva con Modales?
¿El que realiza la acción es desconocido o poco importante?
¿Necesitas expresar posibilidad, necesidad o consejo?
¿Quieres sonar más formal u objetivo?
Significados de los Modales en Pasiva
Obligación
- • Must be done
- • Has to be done
Posibilidad
- • Can be done
- • Could be done
- • May be done
- • Might be done
Consejo
- • Should be done
- • Ought to be done
Futuro
- • Will be done
Ejemplos por nivel
The car can be washed.
El coche se puede lavar.
The food must be eaten.
La comida debe ser comida.
The door should be closed.
La puerta debería estar cerrada.
Can the window be opened?
¿Se puede abrir la ventana?
The bill must be paid now.
La cuenta debe pagarse ahora.
The letters can be sent tomorrow.
Las cartas pueden enviarse mañana.
The room should be cleaned every day.
La habitación debe limpiarse todos los días.
This game cannot be played alone.
Este juego no se puede jugar solo.
The results might be announced later today.
Los resultados podrían anunciarse más tarde hoy.
All staff members must be informed of the change.
Todos los miembros del personal deben ser informados del cambio.
The bridge could be built in two years.
El puente podría construirse en dos años.
Should the meeting be rescheduled?
¿Debería reprogramarse la reunión?
The report should have been submitted yesterday.
El informe debería haber sido entregado ayer.
The software may be updated automatically.
El software puede actualizarse automáticamente.
The suspect must have been seen by someone.
El sospechoso debe haber sido visto por alguien.
These rules ought to be followed strictly.
Estas reglas deberían seguirse estrictamente.
The proposal could have been more clearly articulated.
La propuesta podría haber sido articulada más claramente.
It must be ensured that all safety protocols are met.
Debe asegurarse de que se cumplan todos los protocolos de seguridad.
The data might have been misinterpreted by the researchers.
Los datos podrían haber sido malinterpretados por los investigadores.
Such behavior will not be tolerated in this institution.
Tal comportamiento no será tolerado en esta institución.
The nuances of the contract ought to have been more thoroughly scrutinized.
Los matices del contrato deberían haber sido escrutados más a fondo.
The artifacts may well have been being moved when the fire broke out.
Es muy posible que los artefactos estuvieran siendo trasladados cuando estalló el incendio.
It shall be deemed that the agreement is null and void.
Se considerará que el acuerdo es nulo y sin valor.
The project could not have been brought to fruition without your support.
El proyecto no podría haber llegado a buen término sin su apoyo.
Fácil de confundir
Learners often use the active form when they mean the passive, especially with 'should have'.
Mixing up the perfect active and perfect passive.
Using 'must not' for logical impossibility.
Errores comunes
It must done.
It must be done.
The car can washed.
The car can be washed.
It can be do.
It can be done.
Must be it done?
Must it be done?
It should be finish.
It should be finished.
The bill must be pay.
The bill must be paid.
It not can be done.
It cannot be done.
It should have done.
It should have been done.
The work might been finished.
The work might have been finished.
It must be being done.
It must be done.
The data should have been being analyzed.
The data should have been analyzed.
It ought to been seen.
It ought to have been seen.
The results can be interpreted as...
The results could be interpreted as...
It must not have been done.
It can't have been done.
Patrones de oraciones
The ___ must be ___ by ___.
It could be argued that ___.
The ___ should have been ___ earlier.
Under no circumstances may the ___ be ___.
Real World Usage
The files should be uploaded to the shared folder by EOD.
The deposit shall be returned within 30 days.
The bracket must be secured with four screws.
The results could be interpreted as a shift in consumer behavior.
Baggage must not be left unattended.
Your password can be reset using the link below.
¡Siempre incluye 'be'!
The document must be signed.
¡Ojo con tu V3!
The work should be done, not The work should be do.
Usa 'by' con moderación
The decision will be announced soon, not The decision will be announced by the CEO (unless the CEO is key).
El contexto es el rey
The meeting might be cancelled (we all know who cancels meetings).
Flexibilidad con adverbios
The issue should be carefully examined.
Smart Tips
Change 'I must finish this' to 'This must be finished'. It sounds less like a personal struggle and more like a professional requirement.
Use 'should have been' to focus on the task. It reduces conflict.
Check if there is a modal before it. If so, it's a modal passive!
Use 'could be interpreted' or 'might be seen' to avoid sounding too aggressive with your claims.
Pronunciación
Reduction of 'be'
In the phrase 'must be done', the word 'be' is often unstressed and shortened.
Contraction of 'have been'
In 'should have been', 'have been' often sounds like 'av-bin' or 'əv bɪn'.
Stress on the Modal
It MUST be done! (Falling arrow on MUST)
Emphasizing the urgency or necessity.
Memorízalo
Mnemotecnia
Remember 'MBP': Modal + Be + Participle. It's the 'Most Basic Passive' for modals!
Asociación visual
Imagine a robot (the object) being repaired. The robot doesn't fix itself; it 'must be fixed' by a factory arm. The focus is on the robot, not the arm.
Rhyme
If a modal is what you see, don't forget to add the 'be'!
Story
A detective arrives at a crime scene. He says, 'The safe must have been opened from the inside. The guards should have been alerted.' He focuses on the objects and actions because the criminal is unknown.
Word Web
Desafío
Look around your room. Find 3 things that 'should be cleaned' and 2 things that 'could be moved'. Say them out loud.
Notas culturales
British speakers use 'mustn't be' more frequently than Americans, who prefer 'can't be' or 'shouldn't be' for prohibitions.
Modal passives are the standard for 'polite distancing'. It allows a manager to criticize a process without criticizing a person.
The modal 'shall' is almost exclusively used in legal passives to indicate a mandatory requirement.
The passive voice in English evolved from Old English 'weorthan' (to become) and 'beon' (to be). Modals were originally full verbs with their own meanings.
Inicios de conversación
What is one thing in your city that should be improved?
Think of a famous historical event. What should have been done differently?
If you were the president, what laws would be changed immediately?
Can a person's character be judged by their clothes?
Temas para diario
Errores comunes
Test Yourself
The new rules ___ reviewed by the committee soon.
Find and fix the mistake:
The report should be write by tomorrow morning.
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Score: /3
Ejercicios de practica
8 exercisesThe report ___ (must / finish) by tomorrow morning.
Find and fix the mistake:
The car should been fixed yesterday.
Which sentence is most objective?
The stars...
In a modal passive, the word 'be' changes to 'am/is/are' depending on the subject.
A: Why is the office so messy? B: I don't know, it ___ (should / clean) last night.
Select the correct form.
Must be done / Could be done / Should have been done
Score: /8
Practice Bank
13 exercisesThe payment ___ processed by the end of the week.
Her application could be approve soon.
Choose the correct sentence:
Translate into English: 'El problema puede ser resuelto.'
Arrange these words into a sentence:
Match the active sentences with their correct passive modal equivalents:
This sensitive information ___ not be shared outside the company.
A decision will being made by next week.
Which sentence is correct?
Translate into English: 'Se podría discutir en la reunión.'
Rearrange these words into a sentence:
Your reservation ___ be confirmed shortly via email.
Match the modal with its implied context:
Score: /13
Preguntas frecuentes (8)
Yes, in informal English. For example, 'It needs to get done' instead of 'It needs to be done'. However, 'be' is much more common in writing.
'Must not be' is for rules (prohibition), while 'cannot be' is for things that are impossible.
Use the word `by` at the end. 'The law must be signed `by the President`.'
Yes, they are almost identical in meaning, but 'ought to' is slightly more formal or moralistic.
Technically yes (modal passive continuous), but it is very rare and usually replaced by simpler forms like 'might be happening'.
To sound objective. Scientists care about the experiment, not the person holding the test tube. 'The liquid must be heated' sounds more scientific than 'I must heat the liquid'.
No, you are missing the word `have`. It must be 'It should `have` been done'.
When the 'doer' of the action is the most important part of the sentence or when you want to be very direct and personal.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Pasiva con estar/ser o Pasiva Refleja
English uses 'be' + V3, while Spanish often uses 'se' + active verb.
Voix passive avec les modaux
French uses 'on' more frequently than English uses the passive.
Passiv mit Modalverben
German puts the past participle and 'werden' at the end of the sentence.
助動詞 + 受動態 (reru/rareru)
Japanese uses verb suffixes rather than auxiliary verbs like 'be'.
المبني للمجهول مع الأفعال الناقصة
Arabic uses internal vowel changes (morphology) rather than a 'be' auxiliary.
被 (bèi) + Modal
Chinese lacks verb conjugation and the 'be' auxiliary for passives.
Learning Path
Prerequisites
Learn These First
Voz Pasiva: Formación Básica (be + V3)
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