must chuff
Verbe régulier : chuff - chuffed- chuffed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must chuff
you must chuff
he must chuff
we must chuff
you must chuff
they must chuff 	I must be chuffing
you must be chuffing
he must be chuffing
we must be chuffing
you must be chuffing
they must be chuffing	I must have chuffed
you must have chuffed
he must have chuffed
we must have chuffed
you must have chuffed
they must have chuffed	I must have been chuffing
you must have been chuffing
he must have been chuffing
we must have been chuffing
you must have been chuffing
they must have been chuffing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not chuff
you must not chuff
he must not chuff
we must not chuff
you must not chuff
they must not chuff 	I must not be chuffing
you must not be chuffing
he must not be chuffing
we must not be chuffing
you must not be chuffing
they must not be chuffing	I must not have chuffed
you must not have chuffed
he must not have chuffed
we must not have chuffed
you must not have chuffed
they must not have chuffed	I must not have been chuffing
you must not have been chuffing
he must not have been chuffing
we must not have been chuffing
you must not have been chuffing
they must not have been chuffing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I chuff?
must you chuff?
must he chuff?
must we chuff?
must you chuff?
must they chuff? 	must I be chuffing?
must you be chuffing?
must he be chuffing?
must we be chuffing?
must you be chuffing?
must they be chuffing? 	must I have chuffed?
must you have chuffed?
must he have chuffed?
must we have chuffed?
must you have chuffed?
must they have chuffed? 	must I have been chuffing?
must you have been chuffing?
must he have been chuffing?
must we have been chuffing?
must you have been chuffing?
must they have been chuffing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not chuff?
must you not chuff?
must he not chuff?
must we not chuff?
must you not chuff?
must they not chuff? 	must I not be chuffing?
must you not be chuffing?
must he not be chuffing?
must we not be chuffing?
must you not be chuffing?
must they not be chuffing? 	must I not have chuffed?
must you not have chuffed?
must he not have chuffed?
must we not have chuffed?
must you not have chuffed?
must they not have chuffed? 	must I not have been chuffing?
must you not have been chuffing?
must he not have been chuffing?
must we not have been chuffing?
must you not have been chuffing?
must they not have been chuffing?