I could list you could list she could list we could list you could list they could list
V-ing form
I could be listing you could be listing she could be listing we could be listing you could be listing they could be listing
Perfect
I could have listed you could have listed she could have listed we could have listed you could have listed they could have listed
V-ing perfect
I could have been listing you could have been listing she could have been listing we could have been listing you could have been listing they could have been listing
Negation
Simple form
I couldn't list you couldn't list she couldn't list we couldn't list you couldn't list they couldn't list
V-ing form
I couldn't be listing you couldn't be listing she couldn't be listing we couldn't be listing you couldn't be listing they couldn't be listing
Perfect
I couldn't have listed you couldn't have listed she couldn't have listed we couldn't have listed you couldn't have listed they couldn't have listed
V-ing perfect
I couldn't have been listing you couldn't have been listing she couldn't have been listing we couldn't have been listing you couldn't have been listing they couldn't have been listing
Interrogative form
Simple form
could I list? could you list? could she list? could we list? could you list? could they list?
V-ing form
could I be listing? could you be listing? could she be listing? could we be listing? could you be listing? could they be listing?
Perfect
could I have listed? could you have listed? could she have listed? could we have listed? could you have listed? could they have listed?
V-ing perfect
could I have been listing? could you have been listing? could she have been listing? could we have been listing? could you have been listing? could they have been listing?
Interro-negative form
Simple form
couldn't I list? couldn't you list? couldn't she list? couldn't we list? couldn't you list? couldn't they list?
V-ing form
couldn't I be listing? couldn't you be listing? couldn't she be listing? couldn't we be listing? couldn't you be listing? couldn't they be listing?
Perfect
couldn't I have listed? couldn't you have listed? couldn't she have listed? couldn't we have listed? couldn't you have listed? couldn't they have listed?
V-ing perfect
couldn't I have been listing? couldn't you have been listing? couldn't she have been listing? couldn't we have been listing? couldn't you have been listing? couldn't they have been listing?