English verb conjugation
SHOULD PIERCE

Regular verb: pierce - pierced - pierced

Affirmation

Simple form	V-ing form
I'd pierce you'd pierce he'd pierce we'd pierce you'd pierce they'd pierce	I'd be piercing you'd be piercing he'd be piercing we'd be piercing you'd be piercing they'd be piercing
Perfect	V-ing perfect
I should've pierced you should've pierced he should've pierced we should've pierced you should've pierced they should've pierced	I should've been piercing you should've been piercing he should've been piercing we should've been piercing you should've been piercing they should've been piercing

Negation

Simple form	V-ing form
I shouldn't pierce you shouldn't pierce he shouldn't pierce we shouldn't pierce you shouldn't pierce they shouldn't pierce	I shouldn't be piercing you shouldn't be piercing he shouldn't be piercing we shouldn't be piercing you shouldn't be piercing they shouldn't be piercing
Perfect	V-ing perfect
I shouldn't have pierced you shouldn't have pierced he shouldn't have pierced we shouldn't have pierced you shouldn't have pierced they shouldn't have pierced	I shouldn't have been piercing you shouldn't have been piercing he shouldn't have been piercing we shouldn't have been piercing you shouldn't have been piercing they shouldn't have been piercing

Interrogative form

Simple form	V-ing form
should I pierce? should you pierce? should he pierce? should we pierce? should you pierce? should they pierce?	should I be piercing? should you be piercing? should he be piercing? should we be piercing? should you be piercing? should they be piercing?
Perfect	V-ing perfect
should I have pierced? should you have pierced? should he have pierced? should we have pierced? should you have pierced? should they have pierced?	should I have been piercing? should you have been piercing? should he have been piercing? should we have been piercing? should you have been piercing? should they have been piercing?

Interro-negative form

Simple form	V-ing form
shouldn't I pierce? shouldn't you pierce? shouldn't he pierce? shouldn't we pierce? shouldn't you pierce? shouldn't they pierce?	shouldn't I be piercing? shouldn't you be piercing? shouldn't he be piercing? shouldn't we be piercing? shouldn't you be piercing? shouldn't they be piercing?
Perfect	V-ing perfect
shouldn't I have pierced? shouldn't you have pierced? shouldn't he have pierced? shouldn't we have pierced? shouldn't you have pierced? shouldn't they have pierced?	shouldn't I have been piercing? shouldn't you have been piercing? shouldn't he have been piercing? shouldn't we have been piercing? shouldn't you have been piercing? shouldn't they have been piercing?