must underreact
Verbe régulier : underreact - underreacted- underreacted

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must underreact
you must underreact
he must underreact
we must underreact
you must underreact
they must underreact 	I must be underreacting
you must be underreacting
he must be underreacting
we must be underreacting
you must be underreacting
they must be underreacting	I must have underreacted
you must have underreacted
he must have underreacted
we must have underreacted
you must have underreacted
they must have underreacted	I must have been underreacting
you must have been underreacting
he must have been underreacting
we must have been underreacting
you must have been underreacting
they must have been underreacting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't underreact
you mustn't underreact
he mustn't underreact
we mustn't underreact
you mustn't underreact
they mustn't underreact 	I mustn't be underreacting
you mustn't be underreacting
he mustn't be underreacting
we mustn't be underreacting
you mustn't be underreacting
they mustn't be underreacting	I mustn't have underreacted
you mustn't have underreacted
he mustn't have underreacted
we mustn't have underreacted
you mustn't have underreacted
they mustn't have underreacted	I mustn't have been underreacting
you mustn't have been underreacting
he mustn't have been underreacting
we mustn't have been underreacting
you mustn't have been underreacting
they mustn't have been underreacting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I underreact?
must you underreact?
must he underreact?
must we underreact?
must you underreact?
must they underreact? 	must I be underreacting?
must you be underreacting?
must he be underreacting?
must we be underreacting?
must you be underreacting?
must they be underreacting? 	must I have underreacted?
must you have underreacted?
must he have underreacted?
must we have underreacted?
must you have underreacted?
must they have underreacted? 	must I have been underreacting?
must you have been underreacting?
must he have been underreacting?
must we have been underreacting?
must you have been underreacting?
must they have been underreacting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I underreact?
mustn't you underreact?
mustn't he underreact?
mustn't we underreact?
mustn't you underreact?
mustn't they underreact? 	mustn't I be underreacting?
mustn't you be underreacting?
mustn't he be underreacting?
mustn't we be underreacting?
mustn't you be underreacting?
mustn't they be underreacting? 	mustn't I have underreacted?
mustn't you have underreacted?
mustn't he have underreacted?
mustn't we have underreacted?
mustn't you have underreacted?
mustn't they have underreacted? 	mustn't I have been underreacting?
mustn't you have been underreacting?
mustn't he have been underreacting?
mustn't we have been underreacting?
mustn't you have been underreacting?
mustn't they have been underreacting?