English verb conjugation
SHOULD RIFF

Regular verb: riff - riffed - riffed

Affirmation

Simple form	V-ing form
I'd riff you'd riff he'd riff we'd riff you'd riff they'd riff	I'd be riffing you'd be riffing he'd be riffing we'd be riffing you'd be riffing they'd be riffing
Perfect	V-ing perfect
I should've riffed you should've riffed he 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 he 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
I shouldn't riff you shouldn't riff he 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 he shouldn't be riffing we shouldn't be riffing you shouldn't be riffing they shouldn't be riffing
Perfect	V-ing perfect
I shouldn't have riffed you shouldn't have riffed he 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 he 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
should I riff? should you riff? should he riff? should we riff? should you riff? should they riff?	should I be riffing? should you be riffing? should he be riffing? should we be riffing? should you be riffing? should they be riffing?
Perfect	V-ing perfect
should I have riffed? should you have riffed? should he 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 he 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
shouldn't I riff? shouldn't you riff? shouldn't he 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 he be riffing? shouldn't we be riffing? shouldn't you be riffing? shouldn't they be riffing?
Perfect	V-ing perfect
shouldn't I have riffed? shouldn't you have riffed? shouldn't he 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 he have been riffing? shouldn't we have been riffing? shouldn't you have been riffing? shouldn't they have been riffing?