I'd found you'd found he'd found we'd found you'd found they'd found
V-ing form
I'd be founding you'd be founding he'd be founding we'd be founding you'd be founding they'd be founding
Perfect
I should've founded you should've founded he should've founded we should've founded you should've founded they should've founded
V-ing perfect
I should've been founding you should've been founding he should've been founding we should've been founding you should've been founding they should've been founding
Negation
Simple form
I shouldn't found you shouldn't found he shouldn't found we shouldn't found you shouldn't found they shouldn't found
V-ing form
I shouldn't be founding you shouldn't be founding he shouldn't be founding we shouldn't be founding you shouldn't be founding they shouldn't be founding
Perfect
I shouldn't have founded you shouldn't have founded he shouldn't have founded we shouldn't have founded you shouldn't have founded they shouldn't have founded
V-ing perfect
I shouldn't have been founding you shouldn't have been founding he shouldn't have been founding we shouldn't have been founding you shouldn't have been founding they shouldn't 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
shouldn't I found? shouldn't you found? shouldn't he found? shouldn't we found? shouldn't you found? shouldn't they found?
V-ing form
shouldn't I be founding? shouldn't you be founding? shouldn't he be founding? shouldn't we be founding? shouldn't you be founding? shouldn't they be founding?
Perfect
shouldn't I have founded? shouldn't you have founded? shouldn't he have founded? shouldn't we have founded? shouldn't you have founded? shouldn't they have founded?
V-ing perfect
shouldn't I have been founding? shouldn't you have been founding? shouldn't he have been founding? shouldn't we have been founding? shouldn't you have been founding? shouldn't they have been founding?