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