should spiff
Regular verb: spiff - spiffed- spiffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd spiff
you'd spiff
he'd spiff
we'd spiff
you'd spiff
they'd spiff 	I'd be spiffing
you'd be spiffing
he'd be spiffing
we'd be spiffing
you'd be spiffing
they'd be spiffing	I should've spiffed
you should've spiffed
he should've spiffed
we should've spiffed
you should've spiffed
they should've spiffed	I should've been spiffing
you should've been spiffing
he should've been spiffing
we should've been spiffing
you should've been spiffing
they should've been spiffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't spiff
you shouldn't spiff
he shouldn't spiff
we shouldn't spiff
you shouldn't spiff
they shouldn't spiff 	I shouldn't be spiffing
you shouldn't be spiffing
he shouldn't be spiffing
we shouldn't be spiffing
you shouldn't be spiffing
they shouldn't be spiffing	I shouldn't have spiffed
you shouldn't have spiffed
he shouldn't have spiffed
we shouldn't have spiffed
you shouldn't have spiffed
they shouldn't have spiffed	I shouldn't have been spiffing
you shouldn't have been spiffing
he shouldn't have been spiffing
we shouldn't have been spiffing
you shouldn't have been spiffing
they shouldn't have been spiffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I spiff?
should you spiff?
should he spiff?
should we spiff?
should you spiff?
should they spiff? 	should I be spiffing?
should you be spiffing?
should he be spiffing?
should we be spiffing?
should you be spiffing?
should they be spiffing? 	should I have spiffed?
should you have spiffed?
should he have spiffed?
should we have spiffed?
should you have spiffed?
should they have spiffed? 	should I have been spiffing?
should you have been spiffing?
should he have been spiffing?
should we have been spiffing?
should you have been spiffing?
should they have been spiffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I spiff?
shouldn't you spiff?
shouldn't he spiff?
shouldn't we spiff?
shouldn't you spiff?
shouldn't they spiff? 	shouldn't I be spiffing?
shouldn't you be spiffing?
shouldn't he be spiffing?
shouldn't we be spiffing?
shouldn't you be spiffing?
shouldn't they be spiffing? 	shouldn't I have spiffed?
shouldn't you have spiffed?
shouldn't he have spiffed?
shouldn't we have spiffed?
shouldn't you have spiffed?
shouldn't they have spiffed? 	shouldn't I have been spiffing?
shouldn't you have been spiffing?
shouldn't he have been spiffing?
shouldn't we have been spiffing?
shouldn't you have been spiffing?
shouldn't they have been spiffing?