should tiff
Regular verb: tiff - tiffed- tiffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?