must decuple
Verbe régulier : decuple - decupled- decupled

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must decuple
you must decuple
he must decuple
we must decuple
you must decuple
they must decuple 	I must be decupling
you must be decupling
he must be decupling
we must be decupling
you must be decupling
they must be decupling	I must have decupled
you must have decupled
he must have decupled
we must have decupled
you must have decupled
they must have decupled	I must have been decupling
you must have been decupling
he must have been decupling
we must have been decupling
you must have been decupling
they must have been decupling	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't decuple
you mustn't decuple
he mustn't decuple
we mustn't decuple
you mustn't decuple
they mustn't decuple 	I mustn't be decupling
you mustn't be decupling
he mustn't be decupling
we mustn't be decupling
you mustn't be decupling
they mustn't be decupling	I mustn't have decupled
you mustn't have decupled
he mustn't have decupled
we mustn't have decupled
you mustn't have decupled
they mustn't have decupled	I mustn't have been decupling
you mustn't have been decupling
he mustn't have been decupling
we mustn't have been decupling
you mustn't have been decupling
they mustn't have been decupling	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I decuple?
must you decuple?
must he decuple?
must we decuple?
must you decuple?
must they decuple? 	must I be decupling?
must you be decupling?
must he be decupling?
must we be decupling?
must you be decupling?
must they be decupling? 	must I have decupled?
must you have decupled?
must he have decupled?
must we have decupled?
must you have decupled?
must they have decupled? 	must I have been decupling?
must you have been decupling?
must he have been decupling?
must we have been decupling?
must you have been decupling?
must they have been decupling? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I decuple?
mustn't you decuple?
mustn't he decuple?
mustn't we decuple?
mustn't you decuple?
mustn't they decuple? 	mustn't I be decupling?
mustn't you be decupling?
mustn't he be decupling?
mustn't we be decupling?
mustn't you be decupling?
mustn't they be decupling? 	mustn't I have decupled?
mustn't you have decupled?
mustn't he have decupled?
mustn't we have decupled?
mustn't you have decupled?
mustn't they have decupled? 	mustn't I have been decupling?
mustn't you have been decupling?
mustn't he have been decupling?
mustn't we have been decupling?
mustn't you have been decupling?
mustn't they have been decupling?