I could walk you could walk he could walk we could walk you could walk they could walk
Forma com V-ing
I could be walking you could be walking he could be walking we could be walking you could be walking they could be walking
Perfeito
I could have walked you could have walked he could have walked we could have walked you could have walked they could have walked
Perfeito com V-ing
I could have been walking you could have been walking he could have been walking we could have been walking you could have been walking they could have been walking
Negação
Forma simple
I couldn't walk you couldn't walk he couldn't walk we couldn't walk you couldn't walk they couldn't walk
Forma com V-ing
I couldn't be walking you couldn't be walking he couldn't be walking we couldn't be walking you couldn't be walking they couldn't be walking
Perfeito
I couldn't have walked you couldn't have walked he couldn't have walked we couldn't have walked you couldn't have walked they couldn't have walked
Perfeito com V-ing
I couldn't have been walking you couldn't have been walking he couldn't have been walking we couldn't have been walking you couldn't have been walking they couldn't have been walking
Forma interrogativa
Forma simple
could I walk? could you walk? could he walk? could we walk? could you walk? could they walk?
Forma com V-ing
could I be walking? could you be walking? could he be walking? could we be walking? could you be walking? could they be walking?
Perfeito
could I have walked? could you have walked? could he have walked? could we have walked? could you have walked? could they have walked?
Perfeito com V-ing
could I have been walking? could you have been walking? could he have been walking? could we have been walking? could you have been walking? could they have been walking?
Forma interro-Negação
Forma simple
couldn't I walk? couldn't you walk? couldn't he walk? couldn't we walk? couldn't you walk? couldn't they walk?
Forma com V-ing
couldn't I be walking? couldn't you be walking? couldn't he be walking? couldn't we be walking? couldn't you be walking? couldn't they be walking?
Perfeito
couldn't I have walked? couldn't you have walked? couldn't he have walked? couldn't we have walked? couldn't you have walked? couldn't they have walked?
Perfeito com V-ing
couldn't I have been walking? couldn't you have been walking? couldn't he have been walking? couldn't we have been walking? couldn't you have been walking? couldn't they have been walking?