English verb conjugation
COULD ROLL

Regular verb: roll - rolled - rolled

Affirmation

Simple form	V-ing form
I could roll you could roll he could roll we could roll you could roll they could roll	I could be rolling you could be rolling he could be rolling we could be rolling you could be rolling they could be rolling
Perfect	V-ing perfect
I could have rolled you could have rolled he could have rolled we could have rolled you could have rolled they could have rolled	I could have been rolling you could have been rolling he could have been rolling we could have been rolling you could have been rolling they could have been rolling

Negation

Simple form	V-ing form
I could not roll you could not roll he could not roll we could not roll you could not roll they could not roll	I could not be rolling you could not be rolling he could not be rolling we could not be rolling you could not be rolling they could not be rolling
Perfect	V-ing perfect
I could not have rolled you could not have rolled he could not have rolled we could not have rolled you could not have rolled they could not have rolled	I could not have been rolling you could not have been rolling he could not have been rolling we could not have been rolling you could not have been rolling they could not have been rolling

Interrogative form

Simple form	V-ing form
could I roll? could you roll? could he roll? could we roll? could you roll? could they roll?	could I be rolling? could you be rolling? could he be rolling? could we be rolling? could you be rolling? could they be rolling?
Perfect	V-ing perfect
could I have rolled? could you have rolled? could he have rolled? could we have rolled? could you have rolled? could they have rolled?	could I have been rolling? could you have been rolling? could he have been rolling? could we have been rolling? could you have been rolling? could they have been rolling?

Interro-negative form

Simple form	V-ing form
could I not roll? could you not roll? could he not roll? could we not roll? could you not roll? could they not roll?	could I not be rolling? could you not be rolling? could he not be rolling? could we not be rolling? could you not be rolling? could they not be rolling?
Perfect	V-ing perfect
could I not have rolled? could you not have rolled? could he not have rolled? could we not have rolled? could you not have rolled? could they not have rolled?	could I not have been rolling? could you not have been rolling? could he not have been rolling? could we not have been rolling? could you not have been rolling? could they not have been rolling?