English verb conjugation
COULD LIST

Regular verb: list - listed - listed

Affirmation

Simple form	V-ing form
I could list you could list he could list we could list you could list they could list	I could be listing you could be listing he could be listing we could be listing you could be listing they could be listing
Perfect	V-ing perfect
I could have listed you could have listed he could have listed we could have listed you could have listed they could have listed	I could have been listing you could have been listing he could have been listing we could have been listing you could have been listing they could have been listing

Negation

Simple form	V-ing form
I could not list you could not list he could not list we could not list you could not list they could not list	I could not be listing you could not be listing he could not be listing we could not be listing you could not be listing they could not be listing
Perfect	V-ing perfect
I could not have listed you could not have listed he could not have listed we could not have listed you could not have listed they could not have listed	I could not have been listing you could not have been listing he could not have been listing we could not have been listing you could not have been listing they could not have been listing

Interrogative form

Simple form	V-ing form
could I list? could you list? could he list? could we list? could you list? could they list?	could I be listing? could you be listing? could he be listing? could we be listing? could you be listing? could they be listing?
Perfect	V-ing perfect
could I have listed? could you have listed? could he have listed? could we have listed? could you have listed? could they have listed?	could I have been listing? could you have been listing? could he have been listing? could we have been listing? could you have been listing? could they have been listing?

Interro-negative form

Simple form	V-ing form
could I not list? could you not list? could he not list? could we not list? could you not list? could they not list?	could I not be listing? could you not be listing? could he not be listing? could we not be listing? could you not be listing? could they not be listing?
Perfect	V-ing perfect
could I not have listed? could you not have listed? could he not have listed? could we not have listed? could you not have listed? could they not have listed?	could I not have been listing? could you not have been listing? could he not have been listing? could we not have been listing? could you not have been listing? could they not have been listing?