Los verbos modales expresan posibilidad, permiso, obligacion o capacidad. Son los mismos para todas las personas (no llevan S con he/she/it) y siempre van seguidos del verbo en su forma base.
Modal
Uso principal
Ejemplo
Espanol
CAN
Capacidad/Permiso
I can swim.
Puedo/Sabe nadar
COULD
Capacidad pasada/Formal
Could I use your phone?
Podia/Podria
MUST
Obligacion fuerte
You must study.
Debes/Tienes que
SHOULD
Consejo/Recomendacion
You should sleep early.
Deberias
MAY
Permiso formal/Posibilidad
May I come in?
Puedo/Podria
MIGHT
Posibilidad debil
It might rain.
Podria (dudoso)
WOULD
Condicional/Educado
Would you help me?
Gustaria/Haria
Modal + verbo BASE | No llevan S con he/she/it | She can swim (NO can swims)
Ejercicio 1
Completa: She ___ speak 3 languages.
Respuesta
She can speak 3 languages. — capacidad
Ejercicio 2
Mas formal: Can I use your phone?
Respuesta
Could I use your phone? — could es mas formal y educado
Ejercicio 3
Obligacion: Tienes que estudiar.
Respuesta
You must study. o You have to study.
Ejercicio 4
Consejo: Deberias dormir mas.
Respuesta
You should sleep more.
Ejercicio 5
Diferencia: must vs have to
Respuesta
Must = obligacion interna (yo decido). Have to = obligacion externa (regla/otra persona).
Truco: Modal + verbo base SIEMPRE. Nunca: She cans swim. Nunca: She must to study. Sin TO despues de modales.
Los verbos modales — El sistema completo en ingles
Los verbos modales (can, could, may, might, must, should, would, shall, will) son auxiliares que expresan actitudes hacia la accion: posibilidad, permiso, obligacion, consejo, habilidad, deduccion. Tres reglas unicas: (1) nunca llevan -S en tercera persona, (2) siempre van seguidos de verbo BASE (infinitivo), (3) forman preguntas y negaciones sin DO/DOES/DID.
Modal
Uso 1
Uso 2
Ejemplo positivo
Negativo
CAN
Habilidad presente
Permiso informal
"She can speak 3 languages."
"You can't park here."
COULD
Habilidad pasada
Posibilidad / Permiso formal
"I could swim at age 5." | "Could you help?"
"He couldn't understand."
MAY
Posibilidad ~50%
Permiso formal
"It may rain." | "May I come in?"
"It may not be safe."
MIGHT
Posibilidad ~30%
Sugerencia
"I might go -- not sure."
"She might not come."
MUST
Obligacion fuerte
Deduccion logica positiva
"You must wear a seatbelt." | "She must be tired."
"You mustn't smoke here." (prohibicion fuerte)
SHOULD
Consejo
Expectativa razonable
"You should see a doctor." | "She should be here by now."
"You shouldn't eat so much sugar."
WOULD
Condicional
Solicitud educada
"I would travel if I had money." | "Would you like tea?"
"I wouldn't do that if I were you."
SHALL
Oferta / Sugerencia (formal, britanico)
---
"Shall we dance?" | "Shall I open the window?"
"I shan't be long." (muy formal)
Modales perfectos — Hablar del pasado con modales
Modal + have + participio = hablar de situaciones pasadas hipoteticas o hacer deducciones sobre el pasado:
Estructura
Significado
Ejemplo
Español equivalente
should have + participio
Deberias haber... (pero no lo hiciste)
"You should have studied more." (no estudiaste lo suficiente)
Debiste haber estudiado mas.
could have + participio
Hubieras podido... (pero no lo hiciste)
"She could have won." (tenia la capacidad pero no gano)
Hubiera podido ganar.
must have + participio
Seguramente... (deduccion del pasado)
"He must have forgotten." (hay evidencia de que olvido)
Seguramente olvido.
might have + participio
Quizas... (posibilidad del pasado)
"She might have missed the bus." (no estamos seguros)
Quizas perdio el camion.
would have + participio
Habria... (Third Conditional)
"I would have helped if I had known." (no sabia, no ayude)
Habria ayudado si hubiera sabido.
"You ___ be hungry -- you haven't eaten since this morning!"
"Must" = deduccion logica casi segura (~95%). La evidencia (no ha comido desde la manana) hace casi inevitable la conclusion (tiene hambre). Must es el modal de deduccion positiva de alta certeza.
"You ___ have called me! I was worried." (debiste haber llamado)
"Should have called" = deberias haber llamado (pero no llamaste). Es el arrepentimiento o reproche sobre una accion que no se hizo en el pasado. Modal + have + participio para el pasado.
Los verbos modales (can, could, may, might, must, should, would, shall, will, ought to) son auxiliares que expresan actitudes hacia la accion principal: posibilidad, permiso, obligacion, consejo, habilidad, prediccion. Son invariables (no llevan -S en tercera persona) y siempre van seguidos de verbo en forma base.
Modal
Uso principal
Ejemplo afirmativo
Ejemplo negativo
CAN
Habilidad presente / Permiso informal
She can speak three languages.
You can't park here.
COULD
Habilidad pasada / Posibilidad / Permiso formal
I could swim at age 5. Could you help me?
He couldn't understand the question.
MAY
Posibilidad (50%) / Permiso formal
It may rain tonight. May I leave early?
It may not be the best idea.
MIGHT
Posibilidad menor (30-40%)
I might go to the party. She might be late.
He might not know the answer.
MUST
Obligacion fuerte / Deduccion logica
You must wear a seatbelt. She must be tired.
You must not smoke here. (prohibicion)
SHOULD
Consejo / Recomendacion / Obligacion debil
You should see a doctor. They should arrive soon.
You shouldn't eat so much sugar.
WOULD
Condicional / Solicitud educada / Habito pasado
If I had time, I would travel. Would you like tea?
I wouldn't do that if I were you.
OUGHT TO
Similar a should (mas formal)
You ought to apologize. She ought to be here by now.
He ought not to behave like that.
Los modales perfectos — Hablar del pasado con modales
Cuando combinas un modal con have + participio, hablas de situaciones pasadas hipoteticas o de deducciones sobre el pasado:
SHOULD HAVE + participio
"You should have studied more." (deberias haber estudiado -- pero no lo hiciste) | "I should have called her." (me arrepiento de no haberlo hecho)
COULD HAVE + participio
"She could have won." (hubiera podido ganar -- pero no gano) | "We could have taken the train." (hubieramos podido)
MUST HAVE + participio
"He must have forgotten." (deduccion: seguramente olvido) | "The lights are off -- they must have left." (logica del pasado)
MIGHT HAVE + participio
"She might have missed the bus." (quizas perdio el autobus -- no estamos seguros)
"You ___ study more if you want to pass the exam."
"Should" expresa consejo o recomendacion. "Must" seria obligacion fuerte (una regla). "Should study" = te recomiendo que estudies. En contexto de consejo = should.