could bark
Verbo regular: bark - barked- barked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could bark
you could bark
he could bark
we could bark
you could bark
they could bark 	I could be barking
you could be barking
he could be barking
we could be barking
you could be barking
they could be barking	I could have barked
you could have barked
he could have barked
we could have barked
you could have barked
they could have barked	I could have been barking
you could have been barking
he could have been barking
we could have been barking
you could have been barking
they could have been barking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't bark
you couldn't bark
he couldn't bark
we couldn't bark
you couldn't bark
they couldn't bark 	I couldn't be barking
you couldn't be barking
he couldn't be barking
we couldn't be barking
you couldn't be barking
they couldn't be barking	I couldn't have barked
you couldn't have barked
he couldn't have barked
we couldn't have barked
you couldn't have barked
they couldn't have barked	I couldn't have been barking
you couldn't have been barking
he couldn't have been barking
we couldn't have been barking
you couldn't have been barking
they couldn't have been barking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I bark?
could you bark?
could he bark?
could we bark?
could you bark?
could they bark? 	could I be barking?
could you be barking?
could he be barking?
could we be barking?
could you be barking?
could they be barking? 	could I have barked?
could you have barked?
could he have barked?
could we have barked?
could you have barked?
could they have barked? 	could I have been barking?
could you have been barking?
could he have been barking?
could we have been barking?
could you have been barking?
could they have been barking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I bark?
couldn't you bark?
couldn't he bark?
couldn't we bark?
couldn't you bark?
couldn't they bark? 	couldn't I be barking?
couldn't you be barking?
couldn't he be barking?
couldn't we be barking?
couldn't you be barking?
couldn't they be barking? 	couldn't I have barked?
couldn't you have barked?
couldn't he have barked?
couldn't we have barked?
couldn't you have barked?
couldn't they have barked? 	couldn't I have been barking?
couldn't you have been barking?
couldn't he have been barking?
couldn't we have been barking?
couldn't you have been barking?
couldn't they have been barking?