I could found you could found he could found we could found you could found they could found
Forma con 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
Perfecto
I could have founded you could have founded he could have founded we could have founded you could have founded they could have founded
Perfecto con 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
Negación
Forma simple
I couldn't found you couldn't found he couldn't found we couldn't found you couldn't found they couldn't found
Forma con V-ing
I couldn't be founding you couldn't be founding he couldn't be founding we couldn't be founding you couldn't be founding they couldn't be founding
Perfecto
I couldn't have founded you couldn't have founded he couldn't have founded we couldn't have founded you couldn't have founded they couldn't have founded
Perfecto con V-ing
I couldn't have been founding you couldn't have been founding he couldn't have been founding we couldn't have been founding you couldn't have been founding they couldn't 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 con 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?
Perfecto
could I have founded? could you have founded? could he have founded? could we have founded? could you have founded? could they have founded?
Perfecto con 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-negativa
Forma simple
couldn't I found? couldn't you found? couldn't he found? couldn't we found? couldn't you found? couldn't they found?
Forma con V-ing
couldn't I be founding? couldn't you be founding? couldn't he be founding? couldn't we be founding? couldn't you be founding? couldn't they be founding?
Perfecto
couldn't I have founded? couldn't you have founded? couldn't he have founded? couldn't we have founded? couldn't you have founded? couldn't they have founded?
Perfecto con V-ing
couldn't I have been founding? couldn't you have been founding? couldn't he have been founding? couldn't we have been founding? couldn't you have been founding? couldn't they have been founding?