should riff
Regular verb: riff - riffed- riffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd riff
you'd riff
she'd riff
we'd riff
you'd riff
they'd riff 	I'd be riffing
you'd be riffing
she'd be riffing
we'd be riffing
you'd be riffing
they'd be riffing	I should've riffed
you should've riffed
she should've riffed
we should've riffed
you should've riffed
they should've riffed	I should've been riffing
you should've been riffing
she should've been riffing
we should've been riffing
you should've been riffing
they should've been riffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't riff
you shouldn't riff
she shouldn't riff
we shouldn't riff
you shouldn't riff
they shouldn't riff 	I shouldn't be riffing
you shouldn't be riffing
she shouldn't be riffing
we shouldn't be riffing
you shouldn't be riffing
they shouldn't be riffing	I shouldn't have riffed
you shouldn't have riffed
she shouldn't have riffed
we shouldn't have riffed
you shouldn't have riffed
they shouldn't have riffed	I shouldn't have been riffing
you shouldn't have been riffing
she shouldn't have been riffing
we shouldn't have been riffing
you shouldn't have been riffing
they shouldn't have been riffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I riff?
should you riff?
should she riff?
should we riff?
should you riff?
should they riff? 	should I be riffing?
should you be riffing?
should she be riffing?
should we be riffing?
should you be riffing?
should they be riffing? 	should I have riffed?
should you have riffed?
should she have riffed?
should we have riffed?
should you have riffed?
should they have riffed? 	should I have been riffing?
should you have been riffing?
should she have been riffing?
should we have been riffing?
should you have been riffing?
should they have been riffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I riff?
shouldn't you riff?
shouldn't she riff?
shouldn't we riff?
shouldn't you riff?
shouldn't they riff? 	shouldn't I be riffing?
shouldn't you be riffing?
shouldn't she be riffing?
shouldn't we be riffing?
shouldn't you be riffing?
shouldn't they be riffing? 	shouldn't I have riffed?
shouldn't you have riffed?
shouldn't she have riffed?
shouldn't we have riffed?
shouldn't you have riffed?
shouldn't they have riffed? 	shouldn't I have been riffing?
shouldn't you have been riffing?
shouldn't she have been riffing?
shouldn't we have been riffing?
shouldn't you have been riffing?
shouldn't they have been riffing?