I could found you could found he could found we could found you could found they could found
Forma com V-ing
I could be founding you could be founding he could be founding we could be founding you could be founding they could be founding
Perfeito
I could have founded you could have founded he could have founded we could have founded you could have founded they could have founded
Perfeito com V-ing
I could have been founding you could have been founding he could have been founding we could have been founding you could have been founding they could have been founding
Negação
Forma simple
I could not found you could not found he could not found we could not found you could not found they could not found
Forma com V-ing
I could not be founding you could not be founding he could not be founding we could not be founding you could not be founding they could not be founding
Perfeito
I could not have founded you could not have founded he could not have founded we could not have founded you could not have founded they could not have founded
Perfeito com V-ing
I could not have been founding you could not have been founding he could not have been founding we could not have been founding you could not have been founding they could not have been founding
Forma interrogativa
Forma simple
could I found? could you found? could he found? could we found? could you found? could they found?
Forma com V-ing
could I be founding? could you be founding? could he be founding? could we be founding? could you be founding? could they be founding?
Perfeito
could I have founded? could you have founded? could he have founded? could we have founded? could you have founded? could they have founded?
Perfeito com V-ing
could I have been founding? could you have been founding? could he have been founding? could we have been founding? could you have been founding? could they have been founding?
Forma interro-Negação
Forma simple
could I not found? could you not found? could he not found? could we not found? could you not found? could they not found?
Forma com V-ing
could I not be founding? could you not be founding? could he not be founding? could we not be founding? could you not be founding? could they not be founding?
Perfeito
could I not have founded? could you not have founded? could he not have founded? could we not have founded? could you not have founded? could they not have founded?
Perfeito com V-ing
could I not have been founding? could you not have been founding? could he not have been founding? could we not have been founding? could you not have been founding? could they not have been founding?