I'd be discovering you'd be discovering he'd be discovering we'd be discovering you'd be discovering they'd be discovering
Perfect
I should've discovered you should've discovered he should've discovered we should've discovered you should've discovered they should've discovered
V-ing perfect
I should've been discovering you should've been discovering he should've been discovering we should've been discovering you should've been discovering they should've been discovering
Negation
Simple form
I shouldn't discover you shouldn't discover he shouldn't discover we shouldn't discover you shouldn't discover they shouldn't discover
V-ing form
I shouldn't be discovering you shouldn't be discovering he shouldn't be discovering we shouldn't be discovering you shouldn't be discovering they shouldn't be discovering
Perfect
I shouldn't have discovered you shouldn't have discovered he shouldn't have discovered we shouldn't have discovered you shouldn't have discovered they shouldn't have discovered
V-ing perfect
I shouldn't have been discovering you shouldn't have been discovering he shouldn't have been discovering we shouldn't have been discovering you shouldn't have been discovering they shouldn't have been discovering
Interrogative form
Simple form
should I discover? should you discover? should he discover? should we discover? should you discover? should they discover?
V-ing form
should I be discovering? should you be discovering? should he be discovering? should we be discovering? should you be discovering? should they be discovering?
Perfect
should I have discovered? should you have discovered? should he have discovered? should we have discovered? should you have discovered? should they have discovered?
V-ing perfect
should I have been discovering? should you have been discovering? should he have been discovering? should we have been discovering? should you have been discovering? should they have been discovering?
Interro-negative form
Simple form
shouldn't I discover? shouldn't you discover? shouldn't he discover? shouldn't we discover? shouldn't you discover? shouldn't they discover?
V-ing form
shouldn't I be discovering? shouldn't you be discovering? shouldn't he be discovering? shouldn't we be discovering? shouldn't you be discovering? shouldn't they be discovering?
Perfect
shouldn't I have discovered? shouldn't you have discovered? shouldn't he have discovered? shouldn't we have discovered? shouldn't you have discovered? shouldn't they have discovered?
V-ing perfect
shouldn't I have been discovering? shouldn't you have been discovering? shouldn't he have been discovering? shouldn't we have been discovering? shouldn't you have been discovering? shouldn't they have been discovering?