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 could not walk
you could not walk
he could not walk
we could not walk
you could not walk
they could not walk 	I could not be walking
you could not be walking
he could not be walking
we could not be walking
you could not be walking
they could not be walking	I could not have walked
you could not have walked
he could not have walked
we could not have walked
you could not have walked
they could not have walked	I could not have been walking
you could not have been walking
he could not have been walking
we could not have been walking
you could not have been walking
they could not 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 	
could I not walk?
could you not walk?
could he not walk?
could we not walk?
could you not walk?
could they not walk? 	could I not be walking?
could you not be walking?
could he not be walking?
could we not be walking?
could you not be walking?
could they not be walking? 	could I not have walked?
could you not have walked?
could he not have walked?
could we not have walked?
could you not have walked?
could they not have walked? 	could I not have been walking?
could you not have been walking?
could he not have been walking?
could we not have been walking?
could you not have been walking?
could they not have been walking?