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