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