must function
Verbe régulier : function - functioned- functioned
Traduction française : fonctionner - marcher 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must function
you must function
he must function
we must function
you must function
they must function 	I must be functioning
you must be functioning
he must be functioning
we must be functioning
you must be functioning
they must be functioning	I must have functioned
you must have functioned
he must have functioned
we must have functioned
you must have functioned
they must have functioned	I must have been functioning
you must have been functioning
he must have been functioning
we must have been functioning
you must have been functioning
they must have been functioning	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't function
you mustn't function
he mustn't function
we mustn't function
you mustn't function
they mustn't function 	I mustn't be functioning
you mustn't be functioning
he mustn't be functioning
we mustn't be functioning
you mustn't be functioning
they mustn't be functioning	I mustn't have functioned
you mustn't have functioned
he mustn't have functioned
we mustn't have functioned
you mustn't have functioned
they mustn't have functioned	I mustn't have been functioning
you mustn't have been functioning
he mustn't have been functioning
we mustn't have been functioning
you mustn't have been functioning
they mustn't have been functioning	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I function?
must you function?
must he function?
must we function?
must you function?
must they function? 	must I be functioning?
must you be functioning?
must he be functioning?
must we be functioning?
must you be functioning?
must they be functioning? 	must I have functioned?
must you have functioned?
must he have functioned?
must we have functioned?
must you have functioned?
must they have functioned? 	must I have been functioning?
must you have been functioning?
must he have been functioning?
must we have been functioning?
must you have been functioning?
must they have been functioning? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I function?
mustn't you function?
mustn't he function?
mustn't we function?
mustn't you function?
mustn't they function? 	mustn't I be functioning?
mustn't you be functioning?
mustn't he be functioning?
mustn't we be functioning?
mustn't you be functioning?
mustn't they be functioning? 	mustn't I have functioned?
mustn't you have functioned?
mustn't he have functioned?
mustn't we have functioned?
mustn't you have functioned?
mustn't they have functioned? 	mustn't I have been functioning?
mustn't you have been functioning?
mustn't he have been functioning?
mustn't we have been functioning?
mustn't you have been functioning?
mustn't they have been functioning?