I could characterize you could characterize he could characterize we could characterize you could characterize they could characterize
V-ing form
I could be characterizing you could be characterizing he could be characterizing we could be characterizing you could be characterizing they could be characterizing
Perfect
I could have characterized you could have characterized he could have characterized we could have characterized you could have characterized they could have characterized
V-ing perfect
I could have been characterizing you could have been characterizing he could have been characterizing we could have been characterizing you could have been characterizing they could have been characterizing
Negation
Simple form
I could not characterize you could not characterize he could not characterize we could not characterize you could not characterize they could not characterize
V-ing form
I could not be characterizing you could not be characterizing he could not be characterizing we could not be characterizing you could not be characterizing they could not be characterizing
Perfect
I could not have characterized you could not have characterized he could not have characterized we could not have characterized you could not have characterized they could not have characterized
V-ing perfect
I could not have been characterizing you could not have been characterizing he could not have been characterizing we could not have been characterizing you could not have been characterizing they could not have been characterizing
Interrogative form
Simple form
could I characterize? could you characterize? could he characterize? could we characterize? could you characterize? could they characterize?
V-ing form
could I be characterizing? could you be characterizing? could he be characterizing? could we be characterizing? could you be characterizing? could they be characterizing?
Perfect
could I have characterized? could you have characterized? could he have characterized? could we have characterized? could you have characterized? could they have characterized?
V-ing perfect
could I have been characterizing? could you have been characterizing? could he have been characterizing? could we have been characterizing? could you have been characterizing? could they have been characterizing?
Interro-negative form
Simple form
could I not characterize? could you not characterize? could he not characterize? could we not characterize? could you not characterize? could they not characterize?
V-ing form
could I not be characterizing? could you not be characterizing? could he not be characterizing? could we not be characterizing? could you not be characterizing? could they not be characterizing?
Perfect
could I not have characterized? could you not have characterized? could he not have characterized? could we not have characterized? could you not have characterized? could they not have characterized?
V-ing perfect
could I not have been characterizing? could you not have been characterizing? could he not have been characterizing? could we not have been characterizing? could you not have been characterizing? could they not have been characterizing?