I could enumerate you could enumerate he could enumerate we could enumerate you could enumerate they could enumerate
V-ing form
I could be enumerating you could be enumerating he could be enumerating we could be enumerating you could be enumerating they could be enumerating
Perfect
I could have enumerated you could have enumerated he could have enumerated we could have enumerated you could have enumerated they could have enumerated
V-ing perfect
I could have been enumerating you could have been enumerating he could have been enumerating we could have been enumerating you could have been enumerating they could have been enumerating
Negation
Simple form
I could not enumerate you could not enumerate he could not enumerate we could not enumerate you could not enumerate they could not enumerate
V-ing form
I could not be enumerating you could not be enumerating he could not be enumerating we could not be enumerating you could not be enumerating they could not be enumerating
Perfect
I could not have enumerated you could not have enumerated he could not have enumerated we could not have enumerated you could not have enumerated they could not have enumerated
V-ing perfect
I could not have been enumerating you could not have been enumerating he could not have been enumerating we could not have been enumerating you could not have been enumerating they could not have been enumerating
Interrogative form
Simple form
could I enumerate? could you enumerate? could he enumerate? could we enumerate? could you enumerate? could they enumerate?
V-ing form
could I be enumerating? could you be enumerating? could he be enumerating? could we be enumerating? could you be enumerating? could they be enumerating?
Perfect
could I have enumerated? could you have enumerated? could he have enumerated? could we have enumerated? could you have enumerated? could they have enumerated?
V-ing perfect
could I have been enumerating? could you have been enumerating? could he have been enumerating? could we have been enumerating? could you have been enumerating? could they have been enumerating?
Interro-negative form
Simple form
could I not enumerate? could you not enumerate? could he not enumerate? could we not enumerate? could you not enumerate? could they not enumerate?
V-ing form
could I not be enumerating? could you not be enumerating? could he not be enumerating? could we not be enumerating? could you not be enumerating? could they not be enumerating?
Perfect
could I not have enumerated? could you not have enumerated? could he not have enumerated? could we not have enumerated? could you not have enumerated? could they not have enumerated?
V-ing perfect
could I not have been enumerating? could you not have been enumerating? could he not have been enumerating? could we not have been enumerating? could you not have been enumerating? could they not have been enumerating?