English verb conjugation
CAN UNDERVALUE

Regular verb: undervalue - undervalued - undervalued

Affirmation

Simple form	V-ing form
I can undervalue you can undervalue he can undervalue we can undervalue you can undervalue they can undervalue	I can be undervaluing you can be undervaluing he can be undervaluing we can be undervaluing you can be undervaluing they can be undervaluing
Perfect	V-ing perfect
I can have undervalued you can have undervalued he can have undervalued we can have undervalued you can have undervalued they can have undervalued	I can have been undervaluing you can have been undervaluing he can have been undervaluing we can have been undervaluing you can have been undervaluing they can have been undervaluing

Negation

Simple form	V-ing form
I can't undervalue you can't undervalue he can't undervalue we can't undervalue you can't undervalue they can't undervalue	I can't be undervaluing you can't be undervaluing he can't be undervaluing we can't be undervaluing you can't be undervaluing they can't be undervaluing
Perfect	V-ing perfect
I can't have undervalued you can't have undervalued he can't have undervalued we can't have undervalued you can't have undervalued they can't have undervalued	I can't have been undervaluing you can't have been undervaluing he can't have been undervaluing we can't have been undervaluing you can't have been undervaluing they can't have been undervaluing

Interrogative form

Simple form	V-ing form
can I undervalue? can you undervalue? can he undervalue? can we undervalue? can you undervalue? can they undervalue?	can I be undervaluing? can you be undervaluing? can he be undervaluing? can we be undervaluing? can you be undervaluing? can they be undervaluing?
Perfect	V-ing perfect
can I have undervalued? can you have undervalued? can he have undervalued? can we have undervalued? can you have undervalued? can they have undervalued?	can I have been undervaluing? can you have been undervaluing? can he have been undervaluing? can we have been undervaluing? can you have been undervaluing? can they have been undervaluing?

Interro-negative form

Simple form	V-ing form
can't I undervalue? can't you undervalue? can't he undervalue? can't we undervalue? can't you undervalue? can't they undervalue?	can't I be undervaluing? can't you be undervaluing? can't he be undervaluing? can't we be undervaluing? can't you be undervaluing? can't they be undervaluing?
Perfect	V-ing perfect
can't I have undervalued? can't you have undervalued? can't he have undervalued? can't we have undervalued? can't you have undervalued? can't they have undervalued?	can't I have been undervaluing? can't you have been undervaluing? can't he have been undervaluing? can't we have been undervaluing? can't you have been undervaluing? can't they have been undervaluing?