English verb conjugation
COULD MESS

Regular verb: mess - messed - messed

Affirmation

Simple form	V-ing form
I could mess you could mess he could mess we could mess you could mess they could mess	I could be messing you could be messing he could be messing we could be messing you could be messing they could be messing
Perfect	V-ing perfect
I could have messed you could have messed he could have messed we could have messed you could have messed they could have messed	I could have been messing you could have been messing he could have been messing we could have been messing you could have been messing they could have been messing

Negation

Simple form	V-ing form
I couldn't mess you couldn't mess he couldn't mess we couldn't mess you couldn't mess they couldn't mess	I couldn't be messing you couldn't be messing he couldn't be messing we couldn't be messing you couldn't be messing they couldn't be messing
Perfect	V-ing perfect
I couldn't have messed you couldn't have messed he couldn't have messed we couldn't have messed you couldn't have messed they couldn't have messed	I couldn't have been messing you couldn't have been messing he couldn't have been messing we couldn't have been messing you couldn't have been messing they couldn't have been messing

Interrogative form

Simple form	V-ing form
could I mess? could you mess? could he mess? could we mess? could you mess? could they mess?	could I be messing? could you be messing? could he be messing? could we be messing? could you be messing? could they be messing?
Perfect	V-ing perfect
could I have messed? could you have messed? could he have messed? could we have messed? could you have messed? could they have messed?	could I have been messing? could you have been messing? could he have been messing? could we have been messing? could you have been messing? could they have been messing?

Interro-negative form

Simple form	V-ing form
couldn't I mess? couldn't you mess? couldn't he mess? couldn't we mess? couldn't you mess? couldn't they mess?	couldn't I be messing? couldn't you be messing? couldn't he be messing? couldn't we be messing? couldn't you be messing? couldn't they be messing?
Perfect	V-ing perfect
couldn't I have messed? couldn't you have messed? couldn't he have messed? couldn't we have messed? couldn't you have messed? couldn't they have messed?	couldn't I have been messing? couldn't you have been messing? couldn't he have been messing? couldn't we have been messing? couldn't you have been messing? couldn't they have been messing?