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