English verb conjugation
SHOULD MASS

Regular verb: mass - massed - massed

Affirmation

Simple form	V-ing form
I'd mass you'd mass he'd mass we'd mass you'd mass they'd mass	I'd be massing you'd be massing he'd be massing we'd be massing you'd be massing they'd be massing
Perfect	V-ing perfect
I should've massed you should've massed he should've massed we should've massed you should've massed they should've massed	I should've been massing you should've been massing he should've been massing we should've been massing you should've been massing they should've been massing

Negation

Simple form	V-ing form
I shouldn't mass you shouldn't mass he shouldn't mass we shouldn't mass you shouldn't mass they shouldn't mass	I shouldn't be massing you shouldn't be massing he shouldn't be massing we shouldn't be massing you shouldn't be massing they shouldn't be massing
Perfect	V-ing perfect
I shouldn't have massed you shouldn't have massed he shouldn't have massed we shouldn't have massed you shouldn't have massed they shouldn't have massed	I shouldn't have been massing you shouldn't have been massing he shouldn't have been massing we shouldn't have been massing you shouldn't have been massing they shouldn't have been massing

Interrogative form

Simple form	V-ing form
should I mass? should you mass? should he mass? should we mass? should you mass? should they mass?	should I be massing? should you be massing? should he be massing? should we be massing? should you be massing? should they be massing?
Perfect	V-ing perfect
should I have massed? should you have massed? should he have massed? should we have massed? should you have massed? should they have massed?	should I have been massing? should you have been massing? should he have been massing? should we have been massing? should you have been massing? should they have been massing?

Interro-negative form

Simple form	V-ing form
shouldn't I mass? shouldn't you mass? shouldn't he mass? shouldn't we mass? shouldn't you mass? shouldn't they mass?	shouldn't I be massing? shouldn't you be massing? shouldn't he be massing? shouldn't we be massing? shouldn't you be massing? shouldn't they be massing?
Perfect	V-ing perfect
shouldn't I have massed? shouldn't you have massed? shouldn't he have massed? shouldn't we have massed? shouldn't you have massed? shouldn't they have massed?	shouldn't I have been massing? shouldn't you have been massing? shouldn't he have been massing? shouldn't we have been massing? shouldn't you have been massing? shouldn't they have been massing?