I could brighten you could brighten he could brighten we could brighten you could brighten they could brighten
Forma con V-ing
I could be brightening you could be brightening he could be brightening we could be brightening you could be brightening they could be brightening
Perfecto
I could have brightened you could have brightened he could have brightened we could have brightened you could have brightened they could have brightened
Perfecto con V-ing
I could have been brightening you could have been brightening he could have been brightening we could have been brightening you could have been brightening they could have been brightening
Negación
Forma simple
I couldn't brighten you couldn't brighten he couldn't brighten we couldn't brighten you couldn't brighten they couldn't brighten
Forma con V-ing
I couldn't be brightening you couldn't be brightening he couldn't be brightening we couldn't be brightening you couldn't be brightening they couldn't be brightening
Perfecto
I couldn't have brightened you couldn't have brightened he couldn't have brightened we couldn't have brightened you couldn't have brightened they couldn't have brightened
Perfecto con V-ing
I couldn't have been brightening you couldn't have been brightening he couldn't have been brightening we couldn't have been brightening you couldn't have been brightening they couldn't have been brightening
Forma interrogativa
Forma simple
could I brighten? could you brighten? could he brighten? could we brighten? could you brighten? could they brighten?
Forma con V-ing
could I be brightening? could you be brightening? could he be brightening? could we be brightening? could you be brightening? could they be brightening?
Perfecto
could I have brightened? could you have brightened? could he have brightened? could we have brightened? could you have brightened? could they have brightened?
Perfecto con V-ing
could I have been brightening? could you have been brightening? could he have been brightening? could we have been brightening? could you have been brightening? could they have been brightening?
Forma interro-negativa
Forma simple
couldn't I brighten? couldn't you brighten? couldn't he brighten? couldn't we brighten? couldn't you brighten? couldn't they brighten?
Forma con V-ing
couldn't I be brightening? couldn't you be brightening? couldn't he be brightening? couldn't we be brightening? couldn't you be brightening? couldn't they be brightening?
Perfecto
couldn't I have brightened? couldn't you have brightened? couldn't he have brightened? couldn't we have brightened? couldn't you have brightened? couldn't they have brightened?
Perfecto con V-ing
couldn't I have been brightening? couldn't you have been brightening? couldn't he have been brightening? couldn't we have been brightening? couldn't you have been brightening? couldn't they have been brightening?