I could madden you could madden he could madden we could madden you could madden they could madden
V-ing form
I could be maddening you could be maddening he could be maddening we could be maddening you could be maddening they could be maddening
Perfect
I could have maddened you could have maddened he could have maddened we could have maddened you could have maddened they could have maddened
V-ing perfect
I could have been maddening you could have been maddening he could have been maddening we could have been maddening you could have been maddening they could have been maddening
Negation
Simple form
I could not madden you could not madden he could not madden we could not madden you could not madden they could not madden
V-ing form
I could not be maddening you could not be maddening he could not be maddening we could not be maddening you could not be maddening they could not be maddening
Perfect
I could not have maddened you could not have maddened he could not have maddened we could not have maddened you could not have maddened they could not have maddened
V-ing perfect
I could not have been maddening you could not have been maddening he could not have been maddening we could not have been maddening you could not have been maddening they could not have been maddening
Interrogative form
Simple form
could I madden? could you madden? could he madden? could we madden? could you madden? could they madden?
V-ing form
could I be maddening? could you be maddening? could he be maddening? could we be maddening? could you be maddening? could they be maddening?
Perfect
could I have maddened? could you have maddened? could he have maddened? could we have maddened? could you have maddened? could they have maddened?
V-ing perfect
could I have been maddening? could you have been maddening? could he have been maddening? could we have been maddening? could you have been maddening? could they have been maddening?
Interro-negative form
Simple form
could I not madden? could you not madden? could he not madden? could we not madden? could you not madden? could they not madden?
V-ing form
could I not be maddening? could you not be maddening? could he not be maddening? could we not be maddening? could you not be maddening? could they not be maddening?
Perfect
could I not have maddened? could you not have maddened? could he not have maddened? could we not have maddened? could you not have maddened? could they not have maddened?
V-ing perfect
could I not have been maddening? could you not have been maddening? could he not have been maddening? could we not have been maddening? could you not have been maddening? could they not have been maddening?