must bitter
Verbe régulier : bitter - bittered- bittered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must bitter
you must bitter
he must bitter
we must bitter
you must bitter
they must bitter 	I must be bittering
you must be bittering
he must be bittering
we must be bittering
you must be bittering
they must be bittering	I must have bittered
you must have bittered
he must have bittered
we must have bittered
you must have bittered
they must have bittered	I must have been bittering
you must have been bittering
he must have been bittering
we must have been bittering
you must have been bittering
they must have been bittering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't bitter
you mustn't bitter
he mustn't bitter
we mustn't bitter
you mustn't bitter
they mustn't bitter 	I mustn't be bittering
you mustn't be bittering
he mustn't be bittering
we mustn't be bittering
you mustn't be bittering
they mustn't be bittering	I mustn't have bittered
you mustn't have bittered
he mustn't have bittered
we mustn't have bittered
you mustn't have bittered
they mustn't have bittered	I mustn't have been bittering
you mustn't have been bittering
he mustn't have been bittering
we mustn't have been bittering
you mustn't have been bittering
they mustn't have been bittering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I bitter?
must you bitter?
must he bitter?
must we bitter?
must you bitter?
must they bitter? 	must I be bittering?
must you be bittering?
must he be bittering?
must we be bittering?
must you be bittering?
must they be bittering? 	must I have bittered?
must you have bittered?
must he have bittered?
must we have bittered?
must you have bittered?
must they have bittered? 	must I have been bittering?
must you have been bittering?
must he have been bittering?
must we have been bittering?
must you have been bittering?
must they have been bittering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I bitter?
mustn't you bitter?
mustn't he bitter?
mustn't we bitter?
mustn't you bitter?
mustn't they bitter? 	mustn't I be bittering?
mustn't you be bittering?
mustn't he be bittering?
mustn't we be bittering?
mustn't you be bittering?
mustn't they be bittering? 	mustn't I have bittered?
mustn't you have bittered?
mustn't he have bittered?
mustn't we have bittered?
mustn't you have bittered?
mustn't they have bittered? 	mustn't I have been bittering?
mustn't you have been bittering?
mustn't he have been bittering?
mustn't we have been bittering?
mustn't you have been bittering?
mustn't they have been bittering?