should mass
Regular verb: mass - massed- massed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?