I could walk you could walk she could walk we could walk you could walk they could walk
Forma con V-ing
I could be walking you could be walking she could be walking we could be walking you could be walking they could be walking
Perfecto
I could have walked you could have walked she could have walked we could have walked you could have walked they could have walked
Perfecto con V-ing
I could have been walking you could have been walking she could have been walking we could have been walking you could have been walking they could have been walking
Negación
Forma simple
I couldn't walk you couldn't walk she couldn't walk we couldn't walk you couldn't walk they couldn't walk
Forma con V-ing
I couldn't be walking you couldn't be walking she couldn't be walking we couldn't be walking you couldn't be walking they couldn't be walking
Perfecto
I couldn't have walked you couldn't have walked she couldn't have walked we couldn't have walked you couldn't have walked they couldn't have walked
Perfecto con V-ing
I couldn't have been walking you couldn't have been walking she 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 she walk? could we walk? could you walk? could they walk?
Forma con V-ing
could I be walking? could you be walking? could she be walking? could we be walking? could you be walking? could they be walking?
Perfecto
could I have walked? could you have walked? could she have walked? could we have walked? could you have walked? could they have walked?
Perfecto con V-ing
could I have been walking? could you have been walking? could she have been walking? could we have been walking? could you have been walking? could they have been walking?
Forma interro-negativa
Forma simple
couldn't I walk? couldn't you walk? couldn't she walk? couldn't we walk? couldn't you walk? couldn't they walk?
Forma con V-ing
couldn't I be walking? couldn't you be walking? couldn't she be walking? couldn't we be walking? couldn't you be walking? couldn't they be walking?
Perfecto
couldn't I have walked? couldn't you have walked? couldn't she have walked? couldn't we have walked? couldn't you have walked? couldn't they have walked?
Perfecto con V-ing
couldn't I have been walking? couldn't you have been walking? couldn't she have been walking? couldn't we have been walking? couldn't you have been walking? couldn't they have been walking?