I could exenterate you could exenterate he could exenterate we could exenterate you could exenterate they could exenterate
V-ing form
I could be exenterating you could be exenterating he could be exenterating we could be exenterating you could be exenterating they could be exenterating
Perfect
I could have exenterated you could have exenterated he could have exenterated we could have exenterated you could have exenterated they could have exenterated
V-ing perfect
I could have been exenterating you could have been exenterating he could have been exenterating we could have been exenterating you could have been exenterating they could have been exenterating
Negation
Simple form
I couldn't exenterate you couldn't exenterate he couldn't exenterate we couldn't exenterate you couldn't exenterate they couldn't exenterate
V-ing form
I couldn't be exenterating you couldn't be exenterating he couldn't be exenterating we couldn't be exenterating you couldn't be exenterating they couldn't be exenterating
Perfect
I couldn't have exenterated you couldn't have exenterated he couldn't have exenterated we couldn't have exenterated you couldn't have exenterated they couldn't have exenterated
V-ing perfect
I couldn't have been exenterating you couldn't have been exenterating he couldn't have been exenterating we couldn't have been exenterating you couldn't have been exenterating they couldn't have been exenterating
Interrogative form
Simple form
could I exenterate? could you exenterate? could he exenterate? could we exenterate? could you exenterate? could they exenterate?
V-ing form
could I be exenterating? could you be exenterating? could he be exenterating? could we be exenterating? could you be exenterating? could they be exenterating?
Perfect
could I have exenterated? could you have exenterated? could he have exenterated? could we have exenterated? could you have exenterated? could they have exenterated?
V-ing perfect
could I have been exenterating? could you have been exenterating? could he have been exenterating? could we have been exenterating? could you have been exenterating? could they have been exenterating?
Interro-negative form
Simple form
couldn't I exenterate? couldn't you exenterate? couldn't he exenterate? couldn't we exenterate? couldn't you exenterate? couldn't they exenterate?
V-ing form
couldn't I be exenterating? couldn't you be exenterating? couldn't he be exenterating? couldn't we be exenterating? couldn't you be exenterating? couldn't they be exenterating?
Perfect
couldn't I have exenterated? couldn't you have exenterated? couldn't he have exenterated? couldn't we have exenterated? couldn't you have exenterated? couldn't they have exenterated?
V-ing perfect
couldn't I have been exenterating? couldn't you have been exenterating? couldn't he have been exenterating? couldn't we have been exenterating? couldn't you have been exenterating? couldn't they have been exenterating?