must underact
Verbo regular: underact - underacted- underacted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must underact
you must underact
he must underact
we must underact
you must underact
they must underact 	I must be underacting
you must be underacting
he must be underacting
we must be underacting
you must be underacting
they must be underacting	I must have underacted
you must have underacted
he must have underacted
we must have underacted
you must have underacted
they must have underacted	I must have been underacting
you must have been underacting
he must have been underacting
we must have been underacting
you must have been underacting
they must have been underacting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't underact
you mustn't underact
he mustn't underact
we mustn't underact
you mustn't underact
they mustn't underact 	I mustn't be underacting
you mustn't be underacting
he mustn't be underacting
we mustn't be underacting
you mustn't be underacting
they mustn't be underacting	I mustn't have underacted
you mustn't have underacted
he mustn't have underacted
we mustn't have underacted
you mustn't have underacted
they mustn't have underacted	I mustn't have been underacting
you mustn't have been underacting
he mustn't have been underacting
we mustn't have been underacting
you mustn't have been underacting
they mustn't have been underacting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I underact?
must you underact?
must he underact?
must we underact?
must you underact?
must they underact? 	must I be underacting?
must you be underacting?
must he be underacting?
must we be underacting?
must you be underacting?
must they be underacting? 	must I have underacted?
must you have underacted?
must he have underacted?
must we have underacted?
must you have underacted?
must they have underacted? 	must I have been underacting?
must you have been underacting?
must he have been underacting?
must we have been underacting?
must you have been underacting?
must they have been underacting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I underact?
mustn't you underact?
mustn't he underact?
mustn't we underact?
mustn't you underact?
mustn't they underact? 	mustn't I be underacting?
mustn't you be underacting?
mustn't he be underacting?
mustn't we be underacting?
mustn't you be underacting?
mustn't they be underacting? 	mustn't I have underacted?
mustn't you have underacted?
mustn't he have underacted?
mustn't we have underacted?
mustn't you have underacted?
mustn't they have underacted? 	mustn't I have been underacting?
mustn't you have been underacting?
mustn't he have been underacting?
mustn't we have been underacting?
mustn't you have been underacting?
mustn't they have been underacting?