I could adumbrate you could adumbrate he could adumbrate we could adumbrate you could adumbrate they could adumbrate
V-ing form
I could be adumbrating you could be adumbrating he could be adumbrating we could be adumbrating you could be adumbrating they could be adumbrating
Perfect
I could have adumbrated you could have adumbrated he could have adumbrated we could have adumbrated you could have adumbrated they could have adumbrated
V-ing perfect
I could have been adumbrating you could have been adumbrating he could have been adumbrating we could have been adumbrating you could have been adumbrating they could have been adumbrating
Negation
Simple form
I could not adumbrate you could not adumbrate he could not adumbrate we could not adumbrate you could not adumbrate they could not adumbrate
V-ing form
I could not be adumbrating you could not be adumbrating he could not be adumbrating we could not be adumbrating you could not be adumbrating they could not be adumbrating
Perfect
I could not have adumbrated you could not have adumbrated he could not have adumbrated we could not have adumbrated you could not have adumbrated they could not have adumbrated
V-ing perfect
I could not have been adumbrating you could not have been adumbrating he could not have been adumbrating we could not have been adumbrating you could not have been adumbrating they could not have been adumbrating
Interrogative form
Simple form
could I adumbrate? could you adumbrate? could he adumbrate? could we adumbrate? could you adumbrate? could they adumbrate?
V-ing form
could I be adumbrating? could you be adumbrating? could he be adumbrating? could we be adumbrating? could you be adumbrating? could they be adumbrating?
Perfect
could I have adumbrated? could you have adumbrated? could he have adumbrated? could we have adumbrated? could you have adumbrated? could they have adumbrated?
V-ing perfect
could I have been adumbrating? could you have been adumbrating? could he have been adumbrating? could we have been adumbrating? could you have been adumbrating? could they have been adumbrating?
Interro-negative form
Simple form
could I not adumbrate? could you not adumbrate? could he not adumbrate? could we not adumbrate? could you not adumbrate? could they not adumbrate?
V-ing form
could I not be adumbrating? could you not be adumbrating? could he not be adumbrating? could we not be adumbrating? could you not be adumbrating? could they not be adumbrating?
Perfect
could I not have adumbrated? could you not have adumbrated? could he not have adumbrated? could we not have adumbrated? could you not have adumbrated? could they not have adumbrated?
V-ing perfect
could I not have been adumbrating? could you not have been adumbrating? could he not have been adumbrating? could we not have been adumbrating? could you not have been adumbrating? could they not have been adumbrating?