I could regularize you could regularize he could regularize we could regularize you could regularize they could regularize
V-ing form
I could be regularizing you could be regularizing he could be regularizing we could be regularizing you could be regularizing they could be regularizing
Perfect
I could have regularized you could have regularized he could have regularized we could have regularized you could have regularized they could have regularized
V-ing perfect
I could have been regularizing you could have been regularizing he could have been regularizing we could have been regularizing you could have been regularizing they could have been regularizing
Negation
Simple form
I could not regularize you could not regularize he could not regularize we could not regularize you could not regularize they could not regularize
V-ing form
I could not be regularizing you could not be regularizing he could not be regularizing we could not be regularizing you could not be regularizing they could not be regularizing
Perfect
I could not have regularized you could not have regularized he could not have regularized we could not have regularized you could not have regularized they could not have regularized
V-ing perfect
I could not have been regularizing you could not have been regularizing he could not have been regularizing we could not have been regularizing you could not have been regularizing they could not have been regularizing
Interrogative form
Simple form
could I regularize? could you regularize? could he regularize? could we regularize? could you regularize? could they regularize?
V-ing form
could I be regularizing? could you be regularizing? could he be regularizing? could we be regularizing? could you be regularizing? could they be regularizing?
Perfect
could I have regularized? could you have regularized? could he have regularized? could we have regularized? could you have regularized? could they have regularized?
V-ing perfect
could I have been regularizing? could you have been regularizing? could he have been regularizing? could we have been regularizing? could you have been regularizing? could they have been regularizing?
Interro-negative form
Simple form
could I not regularize? could you not regularize? could he not regularize? could we not regularize? could you not regularize? could they not regularize?
V-ing form
could I not be regularizing? could you not be regularizing? could he not be regularizing? could we not be regularizing? could you not be regularizing? could they not be regularizing?
Perfect
could I not have regularized? could you not have regularized? could he not have regularized? could we not have regularized? could you not have regularized? could they not have regularized?
V-ing perfect
could I not have been regularizing? could you not have been regularizing? could he not have been regularizing? could we not have been regularizing? could you not have been regularizing? could they not have been regularizing?