must underuse
Verbe régulier : underuse - underused- underused
Traduction française : sous-utiliser 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must underuse
you must underuse
she must underuse
we must underuse
you must underuse
they must underuse 	I must be underusing
you must be underusing
she must be underusing
we must be underusing
you must be underusing
they must be underusing	I must have underused
you must have underused
she must have underused
we must have underused
you must have underused
they must have underused	I must have been underusing
you must have been underusing
she must have been underusing
we must have been underusing
you must have been underusing
they must have been underusing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't underuse
you mustn't underuse
she mustn't underuse
we mustn't underuse
you mustn't underuse
they mustn't underuse 	I mustn't be underusing
you mustn't be underusing
she mustn't be underusing
we mustn't be underusing
you mustn't be underusing
they mustn't be underusing	I mustn't have underused
you mustn't have underused
she mustn't have underused
we mustn't have underused
you mustn't have underused
they mustn't have underused	I mustn't have been underusing
you mustn't have been underusing
she mustn't have been underusing
we mustn't have been underusing
you mustn't have been underusing
they mustn't have been underusing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I underuse?
must you underuse?
must she underuse?
must we underuse?
must you underuse?
must they underuse? 	must I be underusing?
must you be underusing?
must she be underusing?
must we be underusing?
must you be underusing?
must they be underusing? 	must I have underused?
must you have underused?
must she have underused?
must we have underused?
must you have underused?
must they have underused? 	must I have been underusing?
must you have been underusing?
must she have been underusing?
must we have been underusing?
must you have been underusing?
must they have been underusing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I underuse?
mustn't you underuse?
mustn't she underuse?
mustn't we underuse?
mustn't you underuse?
mustn't they underuse? 	mustn't I be underusing?
mustn't you be underusing?
mustn't she be underusing?
mustn't we be underusing?
mustn't you be underusing?
mustn't they be underusing? 	mustn't I have underused?
mustn't you have underused?
mustn't she have underused?
mustn't we have underused?
mustn't you have underused?
mustn't they have underused? 	mustn't I have been underusing?
mustn't you have been underusing?
mustn't she have been underusing?
mustn't we have been underusing?
mustn't you have been underusing?
mustn't they have been underusing?