English verb conjugation
COULD UNDERVALUE

Regular verb: undervalue - undervalued - undervalued

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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