I could owe you could owe he could owe we could owe you could owe they could owe
Forma com V-ing
I could be owing you could be owing he could be owing we could be owing you could be owing they could be owing
Perfeito
I could have owed you could have owed he could have owed we could have owed you could have owed they could have owed
Perfeito com V-ing
I could have been owing you could have been owing he could have been owing we could have been owing you could have been owing they could have been owing
Negação
Forma simple
I could not owe you could not owe he could not owe we could not owe you could not owe they could not owe
Forma com V-ing
I could not be owing you could not be owing he could not be owing we could not be owing you could not be owing they could not be owing
Perfeito
I could not have owed you could not have owed he could not have owed we could not have owed you could not have owed they could not have owed
Perfeito com V-ing
I could not have been owing you could not have been owing he could not have been owing we could not have been owing you could not have been owing they could not have been owing
Forma interrogativa
Forma simple
could I owe? could you owe? could he owe? could we owe? could you owe? could they owe?
Forma com V-ing
could I be owing? could you be owing? could he be owing? could we be owing? could you be owing? could they be owing?
Perfeito
could I have owed? could you have owed? could he have owed? could we have owed? could you have owed? could they have owed?
Perfeito com V-ing
could I have been owing? could you have been owing? could he have been owing? could we have been owing? could you have been owing? could they have been owing?
Forma interro-Negação
Forma simple
could I not owe? could you not owe? could he not owe? could we not owe? could you not owe? could they not owe?
Forma com V-ing
could I not be owing? could you not be owing? could he not be owing? could we not be owing? could you not be owing? could they not be owing?
Perfeito
could I not have owed? could you not have owed? could he not have owed? could we not have owed? could you not have owed? could they not have owed?
Perfeito com V-ing
could I not have been owing? could you not have been owing? could he not have been owing? could we not have been owing? could you not have been owing? could they not have been owing?