could listen
Verbo regular: listen - listened- listened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could listen
you could listen
she could listen
we could listen
you could listen
they could listen 	I could be listening
you could be listening
she could be listening
we could be listening
you could be listening
they could be listening	I could have listened
you could have listened
she could have listened
we could have listened
you could have listened
they could have listened	I could have been listening
you could have been listening
she could have been listening
we could have been listening
you could have been listening
they could have been listening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't listen
you couldn't listen
she couldn't listen
we couldn't listen
you couldn't listen
they couldn't listen 	I couldn't be listening
you couldn't be listening
she couldn't be listening
we couldn't be listening
you couldn't be listening
they couldn't be listening	I couldn't have listened
you couldn't have listened
she couldn't have listened
we couldn't have listened
you couldn't have listened
they couldn't have listened	I couldn't have been listening
you couldn't have been listening
she couldn't have been listening
we couldn't have been listening
you couldn't have been listening
they couldn't have been listening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I listen?
could you listen?
could she listen?
could we listen?
could you listen?
could they listen? 	could I be listening?
could you be listening?
could she be listening?
could we be listening?
could you be listening?
could they be listening? 	could I have listened?
could you have listened?
could she have listened?
could we have listened?
could you have listened?
could they have listened? 	could I have been listening?
could you have been listening?
could she have been listening?
could we have been listening?
could you have been listening?
could they have been listening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I listen?
couldn't you listen?
couldn't she listen?
couldn't we listen?
couldn't you listen?
couldn't they listen? 	couldn't I be listening?
couldn't you be listening?
couldn't she be listening?
couldn't we be listening?
couldn't you be listening?
couldn't they be listening? 	couldn't I have listened?
couldn't you have listened?
couldn't she have listened?
couldn't we have listened?
couldn't you have listened?
couldn't they have listened? 	couldn't I have been listening?
couldn't you have been listening?
couldn't she have been listening?
couldn't we have been listening?
couldn't you have been listening?
couldn't they have been listening?