English verb conjugation
SHOULD UNDERVALUE

Regular verb: undervalue - undervalued - undervalued

Affirmation

Simple form	V-ing form
I'd undervalue you'd undervalue he'd undervalue we'd undervalue you'd undervalue they'd undervalue	I'd be undervaluing you'd be undervaluing he'd be undervaluing we'd be undervaluing you'd be undervaluing they'd be undervaluing
Perfect	V-ing perfect
I should've undervalued you should've undervalued he should've undervalued we should've undervalued you should've undervalued they should've undervalued	I should've been undervaluing you should've been undervaluing he should've been undervaluing we should've been undervaluing you should've been undervaluing they should've been undervaluing

Negation

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

Interrogative form

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

Interro-negative form

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