English verb conjugation
COULD ROISTER

Regular verb: roister - roistered - roistered

Affirmation

Simple form	V-ing form
I could roister you could roister he could roister we could roister you could roister they could roister	I could be roistering you could be roistering he could be roistering we could be roistering you could be roistering they could be roistering
Perfect	V-ing perfect
I could have roistered you could have roistered he could have roistered we could have roistered you could have roistered they could have roistered	I could have been roistering you could have been roistering he could have been roistering we could have been roistering you could have been roistering they could have been roistering

Negation

Simple form	V-ing form
I could not roister you could not roister he could not roister we could not roister you could not roister they could not roister	I could not be roistering you could not be roistering he could not be roistering we could not be roistering you could not be roistering they could not be roistering
Perfect	V-ing perfect
I could not have roistered you could not have roistered he could not have roistered we could not have roistered you could not have roistered they could not have roistered	I could not have been roistering you could not have been roistering he could not have been roistering we could not have been roistering you could not have been roistering they could not have been roistering

Interrogative form

Simple form	V-ing form
could I roister? could you roister? could he roister? could we roister? could you roister? could they roister?	could I be roistering? could you be roistering? could he be roistering? could we be roistering? could you be roistering? could they be roistering?
Perfect	V-ing perfect
could I have roistered? could you have roistered? could he have roistered? could we have roistered? could you have roistered? could they have roistered?	could I have been roistering? could you have been roistering? could he have been roistering? could we have been roistering? could you have been roistering? could they have been roistering?

Interro-negative form

Simple form	V-ing form
could I not roister? could you not roister? could he not roister? could we not roister? could you not roister? could they not roister?	could I not be roistering? could you not be roistering? could he not be roistering? could we not be roistering? could you not be roistering? could they not be roistering?
Perfect	V-ing perfect
could I not have roistered? could you not have roistered? could he not have roistered? could we not have roistered? could you not have roistered? could they not have roistered?	could I not have been roistering? could you not have been roistering? could he not have been roistering? could we not have been roistering? could you not have been roistering? could they not have been roistering?