English verb conjugation
SHOULD SPIFF

Regular verb: spiff - spiffed - spiffed

Affirmation

Simple form	V-ing form
I should spiff you should spiff she should spiff we should spiff you should spiff they should spiff	I should be spiffing you should be spiffing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she spiff? should we spiff? should you spiff? should they spiff?	should I be spiffing? should you be spiffing? should she 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 she 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 she 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 she 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 she 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 she 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 she not have been spiffing? should we not have been spiffing? should you not have been spiffing? should they not have been spiffing?