I could mess you could mess he could mess we could mess you could mess they could mess
Forma com V-ing
I could be messing you could be messing he could be messing we could be messing you could be messing they could be messing
Perfeito
I could have messed you could have messed he could have messed we could have messed you could have messed they could have messed
Perfeito com V-ing
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
Negação
Forma simple
I could not mess you could not mess he could not mess we could not mess you could not mess they could not mess
Forma com V-ing
I could not be messing you could not be messing he could not be messing we could not be messing you could not be messing they could not be messing
Perfeito
I could not have messed you could not have messed he could not have messed we could not have messed you could not have messed they could not have messed
Perfeito com V-ing
I could not have been messing you could not have been messing he could not have been messing we could not have been messing you could not have been messing they could not have been messing
Forma interrogativa
Forma simple
could I mess? could you mess? could he mess? could we mess? could you mess? could they mess?
Forma com V-ing
could I be messing? could you be messing? could he be messing? could we be messing? could you be messing? could they be messing?
Perfeito
could I have messed? could you have messed? could he have messed? could we have messed? could you have messed? could they have messed?
Perfeito com V-ing
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?
Forma interro-Negação
Forma simple
could I not mess? could you not mess? could he not mess? could we not mess? could you not mess? could they not mess?
Forma com V-ing
could I not be messing? could you not be messing? could he not be messing? could we not be messing? could you not be messing? could they not be messing?
Perfeito
could I not have messed? could you not have messed? could he not have messed? could we not have messed? could you not have messed? could they not have messed?
Perfeito com V-ing
could I not have been messing? could you not have been messing? could he not have been messing? could we not have been messing? could you not have been messing? could they not have been messing?