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