I could found you could found she could found we could found you could found they could found
V-ing form
I could be founding you could be founding she could be founding we could be founding you could be founding they could be founding
Perfect
I could have founded you could have founded she could have founded we could have founded you could have founded they could have founded
V-ing perfect
I could have been founding you could have been founding she could have been founding we could have been founding you could have been founding they could have been founding
Negation
Simple form
I could not found you could not found she could not found we could not found you could not found they could not found
V-ing form
I could not be founding you could not be founding she could not be founding we could not be founding you could not be founding they could not be founding
Perfect
I could not have founded you could not have founded she could not have founded we could not have founded you could not have founded they could not have founded
V-ing perfect
I could not have been founding you could not have been founding she could not have been founding we could not have been founding you could not have been founding they could not have been founding
Interrogative form
Simple form
could I found? could you found? could she found? could we found? could you found? could they found?
V-ing form
could I be founding? could you be founding? could she be founding? could we be founding? could you be founding? could they be founding?
Perfect
could I have founded? could you have founded? could she have founded? could we have founded? could you have founded? could they have founded?
V-ing perfect
could I have been founding? could you have been founding? could she have been founding? could we have been founding? could you have been founding? could they have been founding?
Interro-negative form
Simple form
could I not found? could you not found? could she not found? could we not found? could you not found? could they not found?
V-ing form
could I not be founding? could you not be founding? could she not be founding? could we not be founding? could you not be founding? could they not be founding?
Perfect
could I not have founded? could you not have founded? could she not have founded? could we not have founded? could you not have founded? could they not have founded?
V-ing perfect
could I not have been founding? could you not have been founding? could she not have been founding? could we not have been founding? could you not have been founding? could they not have been founding?