should underprice
Regular verb: underprice - underpriced- underpriced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd underprice
you'd underprice
she'd underprice
we'd underprice
you'd underprice
they'd underprice 	I'd be underpricing
you'd be underpricing
she'd be underpricing
we'd be underpricing
you'd be underpricing
they'd be underpricing	I should've underpriced
you should've underpriced
she should've underpriced
we should've underpriced
you should've underpriced
they should've underpriced	I should've been underpricing
you should've been underpricing
she should've been underpricing
we should've been underpricing
you should've been underpricing
they should've been underpricing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't underprice
you shouldn't underprice
she shouldn't underprice
we shouldn't underprice
you shouldn't underprice
they shouldn't underprice 	I shouldn't be underpricing
you shouldn't be underpricing
she shouldn't be underpricing
we shouldn't be underpricing
you shouldn't be underpricing
they shouldn't be underpricing	I shouldn't have underpriced
you shouldn't have underpriced
she shouldn't have underpriced
we shouldn't have underpriced
you shouldn't have underpriced
they shouldn't have underpriced	I shouldn't have been underpricing
you shouldn't have been underpricing
she shouldn't have been underpricing
we shouldn't have been underpricing
you shouldn't have been underpricing
they shouldn't have been underpricing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I underprice?
should you underprice?
should she underprice?
should we underprice?
should you underprice?
should they underprice? 	should I be underpricing?
should you be underpricing?
should she be underpricing?
should we be underpricing?
should you be underpricing?
should they be underpricing? 	should I have underpriced?
should you have underpriced?
should she have underpriced?
should we have underpriced?
should you have underpriced?
should they have underpriced? 	should I have been underpricing?
should you have been underpricing?
should she have been underpricing?
should we have been underpricing?
should you have been underpricing?
should they have been underpricing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I underprice?
shouldn't you underprice?
shouldn't she underprice?
shouldn't we underprice?
shouldn't you underprice?
shouldn't they underprice? 	shouldn't I be underpricing?
shouldn't you be underpricing?
shouldn't she be underpricing?
shouldn't we be underpricing?
shouldn't you be underpricing?
shouldn't they be underpricing? 	shouldn't I have underpriced?
shouldn't you have underpriced?
shouldn't she have underpriced?
shouldn't we have underpriced?
shouldn't you have underpriced?
shouldn't they have underpriced? 	shouldn't I have been underpricing?
shouldn't you have been underpricing?
shouldn't she have been underpricing?
shouldn't we have been underpricing?
shouldn't you have been underpricing?
shouldn't they have been underpricing?