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