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 couldn't roister you couldn't roister he couldn't roister we couldn't roister you couldn't roister they couldn't roister	I couldn't be roistering you couldn't be roistering he couldn't be roistering we couldn't be roistering you couldn't be roistering they couldn't be roistering
Perfect	V-ing perfect
I couldn't have roistered you couldn't have roistered he couldn't have roistered we couldn't have roistered you couldn't have roistered they couldn't have roistered	I couldn't have been roistering you couldn't have been roistering he couldn't have been roistering we couldn't have been roistering you couldn't have been roistering they couldn't 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
couldn't I roister? couldn't you roister? couldn't he roister? couldn't we roister? couldn't you roister? couldn't they roister?	couldn't I be roistering? couldn't you be roistering? couldn't he be roistering? couldn't we be roistering? couldn't you be roistering? couldn't they be roistering?
Perfect	V-ing perfect
couldn't I have roistered? couldn't you have roistered? couldn't he have roistered? couldn't we have roistered? couldn't you have roistered? couldn't they have roistered?	couldn't I have been roistering? couldn't you have been roistering? couldn't he have been roistering? couldn't we have been roistering? couldn't you have been roistering? couldn't they have been roistering?