English verb conjugation
COULD LISTEN

Regular verb: listen - listened - listened

Affirmation

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