should snowball
Regular verb: snowball - snowballed- snowballed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd snowball
you'd snowball
she'd snowball
we'd snowball
you'd snowball
they'd snowball 	I'd be snowballing
you'd be snowballing
she'd be snowballing
we'd be snowballing
you'd be snowballing
they'd be snowballing	I should've snowballed
you should've snowballed
she should've snowballed
we should've snowballed
you should've snowballed
they should've snowballed	I should've been snowballing
you should've been snowballing
she should've been snowballing
we should've been snowballing
you should've been snowballing
they should've been snowballing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't snowball
you shouldn't snowball
she shouldn't snowball
we shouldn't snowball
you shouldn't snowball
they shouldn't snowball 	I shouldn't be snowballing
you shouldn't be snowballing
she shouldn't be snowballing
we shouldn't be snowballing
you shouldn't be snowballing
they shouldn't be snowballing	I shouldn't have snowballed
you shouldn't have snowballed
she shouldn't have snowballed
we shouldn't have snowballed
you shouldn't have snowballed
they shouldn't have snowballed	I shouldn't have been snowballing
you shouldn't have been snowballing
she shouldn't have been snowballing
we shouldn't have been snowballing
you shouldn't have been snowballing
they shouldn't have been snowballing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I snowball?
should you snowball?
should she snowball?
should we snowball?
should you snowball?
should they snowball? 	should I be snowballing?
should you be snowballing?
should she be snowballing?
should we be snowballing?
should you be snowballing?
should they be snowballing? 	should I have snowballed?
should you have snowballed?
should she have snowballed?
should we have snowballed?
should you have snowballed?
should they have snowballed? 	should I have been snowballing?
should you have been snowballing?
should she have been snowballing?
should we have been snowballing?
should you have been snowballing?
should they have been snowballing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I snowball?
shouldn't you snowball?
shouldn't she snowball?
shouldn't we snowball?
shouldn't you snowball?
shouldn't they snowball? 	shouldn't I be snowballing?
shouldn't you be snowballing?
shouldn't she be snowballing?
shouldn't we be snowballing?
shouldn't you be snowballing?
shouldn't they be snowballing? 	shouldn't I have snowballed?
shouldn't you have snowballed?
shouldn't she have snowballed?
shouldn't we have snowballed?
shouldn't you have snowballed?
shouldn't they have snowballed? 	shouldn't I have been snowballing?
shouldn't you have been snowballing?
shouldn't she have been snowballing?
shouldn't we have been snowballing?
shouldn't you have been snowballing?
shouldn't they have been snowballing?