English verb conjugation
SHOULD TIFF

Regular verb: tiff - tiffed - tiffed

Affirmation

Simple form	V-ing form
I should tiff you should tiff he should tiff we should tiff you should tiff they should tiff	I should be tiffing you should be tiffing he should be tiffing we should be tiffing you should be tiffing they should be tiffing
Perfect	V-ing perfect
I should have tiffed you should have tiffed he should have tiffed we should have tiffed you should have tiffed they should have tiffed	I should have been tiffing you should have been tiffing he should have been tiffing we should have been tiffing you should have been tiffing they should have been tiffing

Negation

Simple form	V-ing form
I should not tiff you should not tiff he should not tiff we should not tiff you should not tiff they should not tiff	I should not be tiffing you should not be tiffing he should not be tiffing we should not be tiffing you should not be tiffing they should not be tiffing
Perfect	V-ing perfect
I should not have tiffed you should not have tiffed he should not have tiffed we should not have tiffed you should not have tiffed they should not have tiffed	I should not have been tiffing you should not have been tiffing he should not have been tiffing we should not have been tiffing you should not have been tiffing they should not have been tiffing

Interrogative form

Simple form	V-ing form
should I tiff? should you tiff? should he tiff? should we tiff? should you tiff? should they tiff?	should I be tiffing? should you be tiffing? should he be tiffing? should we be tiffing? should you be tiffing? should they be tiffing?
Perfect	V-ing perfect
should I have tiffed? should you have tiffed? should he have tiffed? should we have tiffed? should you have tiffed? should they have tiffed?	should I have been tiffing? should you have been tiffing? should he have been tiffing? should we have been tiffing? should you have been tiffing? should they have been tiffing?

Interro-negative form

Simple form	V-ing form
should I not tiff? should you not tiff? should he not tiff? should we not tiff? should you not tiff? should they not tiff?	should I not be tiffing? should you not be tiffing? should he not be tiffing? should we not be tiffing? should you not be tiffing? should they not be tiffing?
Perfect	V-ing perfect
should I not have tiffed? should you not have tiffed? should he not have tiffed? should we not have tiffed? should you not have tiffed? should they not have tiffed?	should I not have been tiffing? should you not have been tiffing? should he not have been tiffing? should we not have been tiffing? should you not have been tiffing? should they not have been tiffing?