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