English verb conjugation
CAN UNDERPRICE

Regular verb: underprice - underpriced - underpriced

Affirmation

Simple form	V-ing form
I can underprice you can underprice he can underprice we can underprice you can underprice they can underprice	I can be underpricing you can be underpricing he can be underpricing we can be underpricing you can be underpricing they can be underpricing
Perfect	V-ing perfect
I can have underpriced you can have underpriced he can have underpriced we can have underpriced you can have underpriced they can have underpriced	I can have been underpricing you can have been underpricing he can have been underpricing we can have been underpricing you can have been underpricing they can have been underpricing

Negation

Simple form	V-ing form
I can't underprice you can't underprice he can't underprice we can't underprice you can't underprice they can't underprice	I can't be underpricing you can't be underpricing he can't be underpricing we can't be underpricing you can't be underpricing they can't be underpricing
Perfect	V-ing perfect
I can't have underpriced you can't have underpriced he can't have underpriced we can't have underpriced you can't have underpriced they can't have underpriced	I can't have been underpricing you can't have been underpricing he can't have been underpricing we can't have been underpricing you can't have been underpricing they can't have been underpricing

Interrogative form

Simple form	V-ing form
can I underprice? can you underprice? can he underprice? can we underprice? can you underprice? can they underprice?	can I be underpricing? can you be underpricing? can he be underpricing? can we be underpricing? can you be underpricing? can they be underpricing?
Perfect	V-ing perfect
can I have underpriced? can you have underpriced? can he have underpriced? can we have underpriced? can you have underpriced? can they have underpriced?	can I have been underpricing? can you have been underpricing? can he have been underpricing? can we have been underpricing? can you have been underpricing? can they have been underpricing?

Interro-negative form

Simple form	V-ing form
can't I underprice? can't you underprice? can't he underprice? can't we underprice? can't you underprice? can't they underprice?	can't I be underpricing? can't you be underpricing? can't he be underpricing? can't we be underpricing? can't you be underpricing? can't they be underpricing?
Perfect	V-ing perfect
can't I have underpriced? can't you have underpriced? can't he have underpriced? can't we have underpriced? can't you have underpriced? can't they have underpriced?	can't I have been underpricing? can't you have been underpricing? can't he have been underpricing? can't we have been underpricing? can't you have been underpricing? can't they have been underpricing?