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