could walk
Verbo regular: walk - walked- walked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could walk
you could walk
he could walk
we could walk
you could walk
they could walk 	I could be walking
you could be walking
he could be walking
we could be walking
you could be walking
they could be walking	I could have walked
you could have walked
he could have walked
we could have walked
you could have walked
they could have walked	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	

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