must percuss
Verbe régulier : percuss - percussed- percussed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must percuss
you must percuss
he must percuss
we must percuss
you must percuss
they must percuss 	I must be percussing
you must be percussing
he must be percussing
we must be percussing
you must be percussing
they must be percussing	I must have percussed
you must have percussed
he must have percussed
we must have percussed
you must have percussed
they must have percussed	I must have been percussing
you must have been percussing
he must have been percussing
we must have been percussing
you must have been percussing
they must have been percussing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't percuss
you mustn't percuss
he mustn't percuss
we mustn't percuss
you mustn't percuss
they mustn't percuss 	I mustn't be percussing
you mustn't be percussing
he mustn't be percussing
we mustn't be percussing
you mustn't be percussing
they mustn't be percussing	I mustn't have percussed
you mustn't have percussed
he mustn't have percussed
we mustn't have percussed
you mustn't have percussed
they mustn't have percussed	I mustn't have been percussing
you mustn't have been percussing
he mustn't have been percussing
we mustn't have been percussing
you mustn't have been percussing
they mustn't have been percussing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I percuss?
must you percuss?
must he percuss?
must we percuss?
must you percuss?
must they percuss? 	must I be percussing?
must you be percussing?
must he be percussing?
must we be percussing?
must you be percussing?
must they be percussing? 	must I have percussed?
must you have percussed?
must he have percussed?
must we have percussed?
must you have percussed?
must they have percussed? 	must I have been percussing?
must you have been percussing?
must he have been percussing?
must we have been percussing?
must you have been percussing?
must they have been percussing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I percuss?
mustn't you percuss?
mustn't he percuss?
mustn't we percuss?
mustn't you percuss?
mustn't they percuss? 	mustn't I be percussing?
mustn't you be percussing?
mustn't he be percussing?
mustn't we be percussing?
mustn't you be percussing?
mustn't they be percussing? 	mustn't I have percussed?
mustn't you have percussed?
mustn't he have percussed?
mustn't we have percussed?
mustn't you have percussed?
mustn't they have percussed? 	mustn't I have been percussing?
mustn't you have been percussing?
mustn't he have been percussing?
mustn't we have been percussing?
mustn't you have been percussing?
mustn't they have been percussing?