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