Tabla de Gramática Inglesa: Modales, Tiempos Verbales, Voz Pasiva y Preposiciones

Modales de Inglés

Habilidad (ability): can = be able to / could
Posibilidad (possibility): can / could / may / might
Ofrecimiento (offer): can / could
Petición (request): can / could / may / would
Ausencia de obligación (no obligation): don't have to = needn't + infinitivo
Obligación (impuesta desde fuera): have to / must + infinitivo
Prohibición: mustn't + infinitivo
Consejo (advice): should / ought to / had better

Tiempos Verbales en Voz Activa y Pasiva

Presente Simple: opens / open → is / are opened
Presente Continuo: is / are opening → is / are being opened

Pasado Simple: opened → was / were opened
Pasado Continuo: was / were opening → was / were being opened

Presente Perfecto: has / have opened → has / have been opened
Pasado Perfecto Simple: had opened → had been opened

Futuro Simple: will open → will be opened
Futuro Perfecto: will have opened → will have been opened

Condicional Simple: would open → would be opened
Condicional Perfecto: would have opened → would have been opened

Infinitivo con to: open → to be opened

Cambios en el Estilo Indirecto

Presente Simple → Pasado Simple
Presente Continuo → Pasado Continuo
Presente Perfecto → Pasado Perfecto
Pasado Simple → Pasado Perfecto
Pasado Continuo → Pasado Perfecto Continuo
Pasado Perfecto → igual
Imperativo → Infinitivo

Otras Equivalencias

will → would
I / me / my / mine → he, she / him, her / his, her / his, hers
you / you (objeto) / your / yours → I / me / my / mine
we / us / our / ours → they / them / their / theirs
this / these → that / those
can → could
must → had to
may → might
needn't → didn't have to
here → there
now → then
... ago → ... before
today → that day
tonight → that night
yesterday → the day before
tomorrow → the next day / the following day
next... → the following...
last... → the previous...
last year → the previous year

Preposiciones en Inglés