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 couldn't enumerate you couldn't enumerate he couldn't enumerate we couldn't enumerate you couldn't enumerate they couldn't enumerate
V-ing form
I couldn't be enumerating you couldn't be enumerating he couldn't be enumerating we couldn't be enumerating you couldn't be enumerating they couldn't be enumerating
Perfect
I couldn't have enumerated you couldn't have enumerated he couldn't have enumerated we couldn't have enumerated you couldn't have enumerated they couldn't have enumerated
V-ing perfect
I couldn't have been enumerating you couldn't have been enumerating he couldn't have been enumerating we couldn't have been enumerating you couldn't have been enumerating they couldn't 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
couldn't I enumerate? couldn't you enumerate? couldn't he enumerate? couldn't we enumerate? couldn't you enumerate? couldn't they enumerate?
V-ing form
couldn't I be enumerating? couldn't you be enumerating? couldn't he be enumerating? couldn't we be enumerating? couldn't you be enumerating? couldn't they be enumerating?
Perfect
couldn't I have enumerated? couldn't you have enumerated? couldn't he have enumerated? couldn't we have enumerated? couldn't you have enumerated? couldn't they have enumerated?
V-ing perfect
couldn't I have been enumerating? couldn't you have been enumerating? couldn't he have been enumerating? couldn't we have been enumerating? couldn't you have been enumerating? couldn't they have been enumerating?