I'd be discovering you'd be discovering she'd be discovering we'd be discovering you'd be discovering they'd be discovering
Perfect
I should've discovered you should've discovered she 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 she 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 she 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 she 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 she 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 she 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 she discover? should we discover? should you discover? should they discover?
V-ing form
should I be discovering? should you be discovering? should she be discovering? should we be discovering? should you be discovering? should they be discovering?
Perfect
should I have discovered? should you have discovered? should she 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 she 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 she 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 she 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 she 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 she have been discovering? shouldn't we have been discovering? shouldn't you have been discovering? shouldn't they have been discovering?