English verb conjugation
SHOULD PLACARD

Regular verb: placard - placarded - placarded

Affirmation

Simple form	V-ing form
I'd placard you'd placard he'd placard we'd placard you'd placard they'd placard	I'd be placarding you'd be placarding he'd be placarding we'd be placarding you'd be placarding they'd be placarding
Perfect	V-ing perfect
I should've placarded you should've placarded he should've placarded we should've placarded you should've placarded they should've placarded	I should've been placarding you should've been placarding he should've been placarding we should've been placarding you should've been placarding they should've been placarding

Negation

Simple form	V-ing form
I shouldn't placard you shouldn't placard he shouldn't placard we shouldn't placard you shouldn't placard they shouldn't placard	I shouldn't be placarding you shouldn't be placarding he shouldn't be placarding we shouldn't be placarding you shouldn't be placarding they shouldn't be placarding
Perfect	V-ing perfect
I shouldn't have placarded you shouldn't have placarded he shouldn't have placarded we shouldn't have placarded you shouldn't have placarded they shouldn't have placarded	I shouldn't have been placarding you shouldn't have been placarding he 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	V-ing form
should I placard? should you placard? should he placard? should we placard? should you placard? should they placard?	should I be placarding? should you be placarding? should he be placarding? should we be placarding? should you be placarding? should they be placarding?
Perfect	V-ing perfect
should I have placarded? should you have placarded? should he have placarded? should we have placarded? should you have placarded? should they have placarded?	should I have been placarding? should you have been placarding? should he have been placarding? should we have been placarding? should you have been placarding? should they have been placarding?

Interro-negative form

Simple form	V-ing form
shouldn't I placard? shouldn't you placard? shouldn't he placard? shouldn't we placard? shouldn't you placard? shouldn't they placard?	shouldn't I be placarding? shouldn't you be placarding? shouldn't he be placarding? shouldn't we be placarding? shouldn't you be placarding? shouldn't they be placarding?
Perfect	V-ing perfect
shouldn't I have placarded? shouldn't you have placarded? shouldn't he have placarded? shouldn't we have placarded? shouldn't you have placarded? shouldn't they have placarded?	shouldn't I have been placarding? shouldn't you have been placarding? shouldn't he have been placarding? shouldn't we have been placarding? shouldn't you have been placarding? shouldn't they have been placarding?