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 could not judge you could not judge he could not judge we could not judge you could not judge they could not judge
V-ing form
I could not be judging you could not be judging he could not be judging we could not be judging you could not be judging they could not be judging
Perfect
I could not have judged you could not have judged he could not have judged we could not have judged you could not have judged they could not have judged
V-ing perfect
I could not have been judging you could not have been judging he could not have been judging we could not have been judging you could not have been judging they could not 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
could I not judge? could you not judge? could he not judge? could we not judge? could you not judge? could they not judge?
V-ing form
could I not be judging? could you not be judging? could he not be judging? could we not be judging? could you not be judging? could they not be judging?
Perfect
could I not have judged? could you not have judged? could he not have judged? could we not have judged? could you not have judged? could they not have judged?
V-ing perfect
could I not have been judging? could you not have been judging? could he not have been judging? could we not have been judging? could you not have been judging? could they not have been judging?