I'd be crediting you'd be crediting she'd be crediting we'd be crediting you'd be crediting they'd be crediting
Perfect
I should've credited you should've credited she should've credited we should've credited you should've credited they should've credited
V-ing perfect
I should've been crediting you should've been crediting she should've been crediting we should've been crediting you should've been crediting they should've been crediting
Negation
Simple form
I shouldn't credit you shouldn't credit she shouldn't credit we shouldn't credit you shouldn't credit they shouldn't credit
V-ing form
I shouldn't be crediting you shouldn't be crediting she shouldn't be crediting we shouldn't be crediting you shouldn't be crediting they shouldn't be crediting
Perfect
I shouldn't have credited you shouldn't have credited she shouldn't have credited we shouldn't have credited you shouldn't have credited they shouldn't have credited
V-ing perfect
I shouldn't have been crediting you shouldn't have been crediting she shouldn't have been crediting we shouldn't have been crediting you shouldn't have been crediting they shouldn't have been crediting
Interrogative form
Simple form
should I credit? should you credit? should she credit? should we credit? should you credit? should they credit?
V-ing form
should I be crediting? should you be crediting? should she be crediting? should we be crediting? should you be crediting? should they be crediting?
Perfect
should I have credited? should you have credited? should she have credited? should we have credited? should you have credited? should they have credited?
V-ing perfect
should I have been crediting? should you have been crediting? should she have been crediting? should we have been crediting? should you have been crediting? should they have been crediting?
Interro-negative form
Simple form
shouldn't I credit? shouldn't you credit? shouldn't she credit? shouldn't we credit? shouldn't you credit? shouldn't they credit?
V-ing form
shouldn't I be crediting? shouldn't you be crediting? shouldn't she be crediting? shouldn't we be crediting? shouldn't you be crediting? shouldn't they be crediting?
Perfect
shouldn't I have credited? shouldn't you have credited? shouldn't she have credited? shouldn't we have credited? shouldn't you have credited? shouldn't they have credited?
V-ing perfect
shouldn't I have been crediting? shouldn't you have been crediting? shouldn't she have been crediting? shouldn't we have been crediting? shouldn't you have been crediting? shouldn't they have been crediting?