English verb conjugation
SHOULD RIFF

Regular verb: riff - riffed - riffed

Affirmation

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

Negation

Simple form	V-ing form
I should not riff you should not riff he should not riff we should not riff you should not riff they should not riff	I should not be riffing you should not be riffing he should not be riffing we should not be riffing you should not be riffing they should not be riffing
Perfect	V-ing perfect
I should not have riffed you should not have riffed he should not have riffed we should not have riffed you should not have riffed they should not have riffed	I should not have been riffing you should not have been riffing he should not have been riffing we should not have been riffing you should not have been riffing they should not 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
should I not riff? should you not riff? should he not riff? should we not riff? should you not riff? should they not riff?	should I not be riffing? should you not be riffing? should he not be riffing? should we not be riffing? should you not be riffing? should they not be riffing?
Perfect	V-ing perfect
should I not have riffed? should you not have riffed? should he not have riffed? should we not have riffed? should you not have riffed? should they not have riffed?	should I not have been riffing? should you not have been riffing? should he not have been riffing? should we not have been riffing? should you not have been riffing? should they not have been riffing?