English verb conjugation
MUST UNDERVALUE

Regular verb: undervalue - undervalued - undervalued

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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