must unbutton
Verbe régulier : unbutton - unbuttoned- unbuttoned
Traduction française : déboutonner - se déboutonner 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must unbutton
you must unbutton
he must unbutton
we must unbutton
you must unbutton
they must unbutton 	I must be unbuttoning
you must be unbuttoning
he must be unbuttoning
we must be unbuttoning
you must be unbuttoning
they must be unbuttoning	I must have unbuttoned
you must have unbuttoned
he must have unbuttoned
we must have unbuttoned
you must have unbuttoned
they must have unbuttoned	I must have been unbuttoning
you must have been unbuttoning
he must have been unbuttoning
we must have been unbuttoning
you must have been unbuttoning
they must have been unbuttoning	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't unbutton
you mustn't unbutton
he mustn't unbutton
we mustn't unbutton
you mustn't unbutton
they mustn't unbutton 	I mustn't be unbuttoning
you mustn't be unbuttoning
he mustn't be unbuttoning
we mustn't be unbuttoning
you mustn't be unbuttoning
they mustn't be unbuttoning	I mustn't have unbuttoned
you mustn't have unbuttoned
he mustn't have unbuttoned
we mustn't have unbuttoned
you mustn't have unbuttoned
they mustn't have unbuttoned	I mustn't have been unbuttoning
you mustn't have been unbuttoning
he mustn't have been unbuttoning
we mustn't have been unbuttoning
you mustn't have been unbuttoning
they mustn't have been unbuttoning	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I unbutton?
must you unbutton?
must he unbutton?
must we unbutton?
must you unbutton?
must they unbutton? 	must I be unbuttoning?
must you be unbuttoning?
must he be unbuttoning?
must we be unbuttoning?
must you be unbuttoning?
must they be unbuttoning? 	must I have unbuttoned?
must you have unbuttoned?
must he have unbuttoned?
must we have unbuttoned?
must you have unbuttoned?
must they have unbuttoned? 	must I have been unbuttoning?
must you have been unbuttoning?
must he have been unbuttoning?
must we have been unbuttoning?
must you have been unbuttoning?
must they have been unbuttoning? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I unbutton?
mustn't you unbutton?
mustn't he unbutton?
mustn't we unbutton?
mustn't you unbutton?
mustn't they unbutton? 	mustn't I be unbuttoning?
mustn't you be unbuttoning?
mustn't he be unbuttoning?
mustn't we be unbuttoning?
mustn't you be unbuttoning?
mustn't they be unbuttoning? 	mustn't I have unbuttoned?
mustn't you have unbuttoned?
mustn't he have unbuttoned?
mustn't we have unbuttoned?
mustn't you have unbuttoned?
mustn't they have unbuttoned? 	mustn't I have been unbuttoning?
mustn't you have been unbuttoning?
mustn't he have been unbuttoning?
mustn't we have been unbuttoning?
mustn't you have been unbuttoning?
mustn't they have been unbuttoning?