English verb conjugation
COULD LISTEN

Regular verb: listen - listened - listened

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I could not listen you could not listen she could not listen we could not listen you could not listen they could not listen	I could not be listening you could not be listening she could not be listening we could not be listening you could not be listening they could not be listening
Perfect	V-ing perfect
I could not have listened you could not have listened she could not have listened we could not have listened you could not have listened they could not have listened	I could not have been listening you could not have been listening she could not have been listening we could not have been listening you could not have been listening they could not have been listening

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
could I not listen? could you not listen? could she not listen? could we not listen? could you not listen? could they not listen?	could I not be listening? could you not be listening? could she not be listening? could we not be listening? could you not be listening? could they not be listening?
Perfect	V-ing perfect
could I not have listened? could you not have listened? could she not have listened? could we not have listened? could you not have listened? could they not have listened?	could I not have been listening? could you not have been listening? could she not have been listening? could we not have been listening? could you not have been listening? could they not have been listening?