I could marbleize you could marbleize he could marbleize we could marbleize you could marbleize they could marbleize
V-ing form
I could be marbleizing you could be marbleizing he could be marbleizing we could be marbleizing you could be marbleizing they could be marbleizing
Perfect
I could have marbleized you could have marbleized he could have marbleized we could have marbleized you could have marbleized they could have marbleized
V-ing perfect
I could have been marbleizing you could have been marbleizing he could have been marbleizing we could have been marbleizing you could have been marbleizing they could have been marbleizing
Negation
Simple form
I could not marbleize you could not marbleize he could not marbleize we could not marbleize you could not marbleize they could not marbleize
V-ing form
I could not be marbleizing you could not be marbleizing he could not be marbleizing we could not be marbleizing you could not be marbleizing they could not be marbleizing
Perfect
I could not have marbleized you could not have marbleized he could not have marbleized we could not have marbleized you could not have marbleized they could not have marbleized
V-ing perfect
I could not have been marbleizing you could not have been marbleizing he could not have been marbleizing we could not have been marbleizing you could not have been marbleizing they could not have been marbleizing
Interrogative form
Simple form
could I marbleize? could you marbleize? could he marbleize? could we marbleize? could you marbleize? could they marbleize?
V-ing form
could I be marbleizing? could you be marbleizing? could he be marbleizing? could we be marbleizing? could you be marbleizing? could they be marbleizing?
Perfect
could I have marbleized? could you have marbleized? could he have marbleized? could we have marbleized? could you have marbleized? could they have marbleized?
V-ing perfect
could I have been marbleizing? could you have been marbleizing? could he have been marbleizing? could we have been marbleizing? could you have been marbleizing? could they have been marbleizing?
Interro-negative form
Simple form
could I not marbleize? could you not marbleize? could he not marbleize? could we not marbleize? could you not marbleize? could they not marbleize?
V-ing form
could I not be marbleizing? could you not be marbleizing? could he not be marbleizing? could we not be marbleizing? could you not be marbleizing? could they not be marbleizing?
Perfect
could I not have marbleized? could you not have marbleized? could he not have marbleized? could we not have marbleized? could you not have marbleized? could they not have marbleized?
V-ing perfect
could I not have been marbleizing? could you not have been marbleizing? could he not have been marbleizing? could we not have been marbleizing? could you not have been marbleizing? could they not have been marbleizing?