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 couldn't roll you couldn't roll he couldn't roll we couldn't roll you couldn't roll they couldn't roll	I couldn't be rolling you couldn't be rolling he couldn't be rolling we couldn't be rolling you couldn't be rolling they couldn't be rolling
Perfect	V-ing perfect
I couldn't have rolled you couldn't have rolled he couldn't have rolled we couldn't have rolled you couldn't have rolled they couldn't have rolled	I couldn't have been rolling you couldn't have been rolling he couldn't have been rolling we couldn't have been rolling you couldn't have been rolling they couldn't 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
couldn't I roll? couldn't you roll? couldn't he roll? couldn't we roll? couldn't you roll? couldn't they roll?	couldn't I be rolling? couldn't you be rolling? couldn't he be rolling? couldn't we be rolling? couldn't you be rolling? couldn't they be rolling?
Perfect	V-ing perfect
couldn't I have rolled? couldn't you have rolled? couldn't he have rolled? couldn't we have rolled? couldn't you have rolled? couldn't they have rolled?	couldn't I have been rolling? couldn't you have been rolling? couldn't he have been rolling? couldn't we have been rolling? couldn't you have been rolling? couldn't they have been rolling?