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