must decease decease
Verbe régulier : decease decease - decease deceased- decease deceased

, ce verbe peut ne pas exister, la conjugaison est donnée à titre d'exemple.

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must decease decease
you must decease decease
he must decease decease
we must decease decease
you must decease decease
they must decease decease 	I must be decease deceasing
you must be decease deceasing
he must be decease deceasing
we must be decease deceasing
you must be decease deceasing
they must be decease deceasing	I must have decease deceased
you must have decease deceased
he must have decease deceased
we must have decease deceased
you must have decease deceased
they must have decease deceased	I must have been decease deceasing
you must have been decease deceasing
he must have been decease deceasing
we must have been decease deceasing
you must have been decease deceasing
they must have been decease deceasing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't decease decease
you mustn't decease decease
he mustn't decease decease
we mustn't decease decease
you mustn't decease decease
they mustn't decease decease 	I mustn't be decease deceasing
you mustn't be decease deceasing
he mustn't be decease deceasing
we mustn't be decease deceasing
you mustn't be decease deceasing
they mustn't be decease deceasing	I mustn't have decease deceased
you mustn't have decease deceased
he mustn't have decease deceased
we mustn't have decease deceased
you mustn't have decease deceased
they mustn't have decease deceased	I mustn't have been decease deceasing
you mustn't have been decease deceasing
he mustn't have been decease deceasing
we mustn't have been decease deceasing
you mustn't have been decease deceasing
they mustn't have been decease deceasing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I decease decease?
must you decease decease?
must he decease decease?
must we decease decease?
must you decease decease?
must they decease decease? 	must I be decease deceasing?
must you be decease deceasing?
must he be decease deceasing?
must we be decease deceasing?
must you be decease deceasing?
must they be decease deceasing? 	must I have decease deceased?
must you have decease deceased?
must he have decease deceased?
must we have decease deceased?
must you have decease deceased?
must they have decease deceased? 	must I have been decease deceasing?
must you have been decease deceasing?
must he have been decease deceasing?
must we have been decease deceasing?
must you have been decease deceasing?
must they have been decease deceasing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I decease decease?
mustn't you decease decease?
mustn't he decease decease?
mustn't we decease decease?
mustn't you decease decease?
mustn't they decease decease? 	mustn't I be decease deceasing?
mustn't you be decease deceasing?
mustn't he be decease deceasing?
mustn't we be decease deceasing?
mustn't you be decease deceasing?
mustn't they be decease deceasing? 	mustn't I have decease deceased?
mustn't you have decease deceased?
mustn't he have decease deceased?
mustn't we have decease deceased?
mustn't you have decease deceased?
mustn't they have decease deceased? 	mustn't I have been decease deceasing?
mustn't you have been decease deceasing?
mustn't he have been decease deceasing?
mustn't we have been decease deceasing?
mustn't you have been decease deceasing?
mustn't they have been decease deceasing?