must undervalue
Verbo regular: undervalue - undervalued- undervalued

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?