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