must concert
Verbe régulier : concert - concerted- concerted
Traduction française : concerter - arranger 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must concert
you must concert
he must concert
we must concert
you must concert
they must concert 	I must be concerting
you must be concerting
he must be concerting
we must be concerting
you must be concerting
they must be concerting	I must have concerted
you must have concerted
he must have concerted
we must have concerted
you must have concerted
they must have concerted	I must have been concerting
you must have been concerting
he must have been concerting
we must have been concerting
you must have been concerting
they must have been concerting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't concert
you mustn't concert
he mustn't concert
we mustn't concert
you mustn't concert
they mustn't concert 	I mustn't be concerting
you mustn't be concerting
he mustn't be concerting
we mustn't be concerting
you mustn't be concerting
they mustn't be concerting	I mustn't have concerted
you mustn't have concerted
he mustn't have concerted
we mustn't have concerted
you mustn't have concerted
they mustn't have concerted	I mustn't have been concerting
you mustn't have been concerting
he mustn't have been concerting
we mustn't have been concerting
you mustn't have been concerting
they mustn't have been concerting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I concert?
must you concert?
must he concert?
must we concert?
must you concert?
must they concert? 	must I be concerting?
must you be concerting?
must he be concerting?
must we be concerting?
must you be concerting?
must they be concerting? 	must I have concerted?
must you have concerted?
must he have concerted?
must we have concerted?
must you have concerted?
must they have concerted? 	must I have been concerting?
must you have been concerting?
must he have been concerting?
must we have been concerting?
must you have been concerting?
must they have been concerting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I concert?
mustn't you concert?
mustn't he concert?
mustn't we concert?
mustn't you concert?
mustn't they concert? 	mustn't I be concerting?
mustn't you be concerting?
mustn't he be concerting?
mustn't we be concerting?
mustn't you be concerting?
mustn't they be concerting? 	mustn't I have concerted?
mustn't you have concerted?
mustn't he have concerted?
mustn't we have concerted?
mustn't you have concerted?
mustn't they have concerted? 	mustn't I have been concerting?
mustn't you have been concerting?
mustn't he have been concerting?
mustn't we have been concerting?
mustn't you have been concerting?
mustn't they have been concerting?