English verb conjugation
SHOULD SPIFF

Regular verb: spiff - spiffed - spiffed

Affirmation

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

Negation

Simple form	V-ing form
I should not spiff you should not spiff he should not spiff we should not spiff you should not spiff they should not spiff	I should not be spiffing you should not be spiffing he should not be spiffing we should not be spiffing you should not be spiffing they should not be spiffing
Perfect	V-ing perfect
I should not have spiffed you should not have spiffed he should not have spiffed we should not have spiffed you should not have spiffed they should not have spiffed	I should not have been spiffing you should not have been spiffing he should not have been spiffing we should not have been spiffing you should not have been spiffing they should not have been spiffing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
should I not spiff? should you not spiff? should he not spiff? should we not spiff? should you not spiff? should they not spiff?	should I not be spiffing? should you not be spiffing? should he not be spiffing? should we not be spiffing? should you not be spiffing? should they not be spiffing?
Perfect	V-ing perfect
should I not have spiffed? should you not have spiffed? should he not have spiffed? should we not have spiffed? should you not have spiffed? should they not have spiffed?	should I not have been spiffing? should you not have been spiffing? should he not have been spiffing? should we not have been spiffing? should you not have been spiffing? should they not have been spiffing?