could listen
Regular verb: listen - listened- listened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could listen
you could listen
he could listen
we could listen
you could listen
they could listen 	I could be listening
you could be listening
he could be listening
we could be listening
you could be listening
they could be listening	I could have listened
you could have listened
he 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
he could have been listening
we could have been listening
you could have been listening
they could have been listening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't listen
you couldn't listen
he 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
he 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
he 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
he couldn't have been listening
we couldn't have been listening
you couldn't have been listening
they couldn't have been listening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I listen?
could you listen?
could he listen?
could we listen?
could you listen?
could they listen? 	could I be listening?
could you be listening?
could he be listening?
could we be listening?
could you be listening?
could they be listening? 	could I have listened?
could you have listened?
could he 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 he have been listening?
could we have been listening?
could you have been listening?
could they have been listening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I listen?
couldn't you listen?
couldn't he 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 he 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 he 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 he have been listening?
couldn't we have been listening?
couldn't you have been listening?
couldn't they have been listening?