Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could roll up you could roll up he could roll up we could roll up you could roll up they could roll up
V-ing form
I could be roll uping you could be roll uping he could be roll uping we could be roll uping you could be roll uping they could be roll uping
Perfect
I could have roll uped you could have roll uped he could have roll uped we could have roll uped you could have roll uped they could have roll uped
V-ing perfect
I could have been roll uping you could have been roll uping he could have been roll uping we could have been roll uping you could have been roll uping they could have been roll uping
Negation
Simple form
I could not roll up you could not roll up he could not roll up we could not roll up you could not roll up they could not roll up
V-ing form
I could not be roll uping you could not be roll uping he could not be roll uping we could not be roll uping you could not be roll uping they could not be roll uping
Perfect
I could not have roll uped you could not have roll uped he could not have roll uped we could not have roll uped you could not have roll uped they could not have roll uped
V-ing perfect
I could not have been roll uping you could not have been roll uping he could not have been roll uping we could not have been roll uping you could not have been roll uping they could not have been roll uping
Interrogative form
Simple form
could I roll up? could you roll up? could he roll up? could we roll up? could you roll up? could they roll up?
V-ing form
could I be roll uping? could you be roll uping? could he be roll uping? could we be roll uping? could you be roll uping? could they be roll uping?
Perfect
could I have roll uped? could you have roll uped? could he have roll uped? could we have roll uped? could you have roll uped? could they have roll uped?
V-ing perfect
could I have been roll uping? could you have been roll uping? could he have been roll uping? could we have been roll uping? could you have been roll uping? could they have been roll uping?
Interro-negative form
Simple form
could I not roll up? could you not roll up? could he not roll up? could we not roll up? could you not roll up? could they not roll up?
V-ing form
could I not be roll uping? could you not be roll uping? could he not be roll uping? could we not be roll uping? could you not be roll uping? could they not be roll uping?
Perfect
could I not have roll uped? could you not have roll uped? could he not have roll uped? could we not have roll uped? could you not have roll uped? could they not have roll uped?
V-ing perfect
could I not have been roll uping? could you not have been roll uping? could he not have been roll uping? could we not have been roll uping? could you not have been roll uping? could they not have been roll uping?