English verb conjugation
COULD MESS

Regular verb: mess - messed - messed

Affirmation

Simple form	V-ing form
I could mess you could mess she could mess we could mess you could mess they could mess	I could be messing you could be messing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she mess? could we mess? could you mess? could they mess?	could I be messing? could you be messing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been messing? couldn't we have been messing? couldn't you have been messing? couldn't they have been messing?