I could prealter you could prealter she could prealter we could prealter you could prealter they could prealter
Forma com V-ing
I could be prealtering you could be prealtering she could be prealtering we could be prealtering you could be prealtering they could be prealtering
Perfeito
I could have prealtered you could have prealtered she could have prealtered we could have prealtered you could have prealtered they could have prealtered
Perfeito com V-ing
I could have been prealtering you could have been prealtering she could have been prealtering we could have been prealtering you could have been prealtering they could have been prealtering
Negação
Forma simple
I could not prealter you could not prealter she could not prealter we could not prealter you could not prealter they could not prealter
Forma com V-ing
I could not be prealtering you could not be prealtering she could not be prealtering we could not be prealtering you could not be prealtering they could not be prealtering
Perfeito
I could not have prealtered you could not have prealtered she could not have prealtered we could not have prealtered you could not have prealtered they could not have prealtered
Perfeito com V-ing
I could not have been prealtering you could not have been prealtering she could not have been prealtering we could not have been prealtering you could not have been prealtering they could not have been prealtering
Forma interrogativa
Forma simple
could I prealter? could you prealter? could she prealter? could we prealter? could you prealter? could they prealter?
Forma com V-ing
could I be prealtering? could you be prealtering? could she be prealtering? could we be prealtering? could you be prealtering? could they be prealtering?
Perfeito
could I have prealtered? could you have prealtered? could she have prealtered? could we have prealtered? could you have prealtered? could they have prealtered?
Perfeito com V-ing
could I have been prealtering? could you have been prealtering? could she have been prealtering? could we have been prealtering? could you have been prealtering? could they have been prealtering?
Forma interro-Negação
Forma simple
could I not prealter? could you not prealter? could she not prealter? could we not prealter? could you not prealter? could they not prealter?
Forma com V-ing
could I not be prealtering? could you not be prealtering? could she not be prealtering? could we not be prealtering? could you not be prealtering? could they not be prealtering?
Perfeito
could I not have prealtered? could you not have prealtered? could she not have prealtered? could we not have prealtered? could you not have prealtered? could they not have prealtered?
Perfeito com V-ing
could I not have been prealtering? could you not have been prealtering? could she not have been prealtering? could we not have been prealtering? could you not have been prealtering? could they not have been prealtering?