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
she must decuple
we must decuple
you must decuple
they must decuple 	I must be decupling
you must be decupling
she must be decupling
we must be decupling
you must be decupling
they must be decupling	I must have decupled
you must have decupled
she 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
she 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 must not decuple
you must not decuple
she must not decuple
we must not decuple
you must not decuple
they must not decuple 	I must not be decupling
you must not be decupling
she must not be decupling
we must not be decupling
you must not be decupling
they must not be decupling	I must not have decupled
you must not have decupled
she must not have decupled
we must not have decupled
you must not have decupled
they must not have decupled	I must not have been decupling
you must not have been decupling
she must not have been decupling
we must not have been decupling
you must not have been decupling
they must not have been decupling	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I decuple?
must you decuple?
must she decuple?
must we decuple?
must you decuple?
must they decuple? 	must I be decupling?
must you be decupling?
must she be decupling?
must we be decupling?
must you be decupling?
must they be decupling? 	must I have decupled?
must you have decupled?
must she 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 she 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 	
must I not decuple?
must you not decuple?
must she not decuple?
must we not decuple?
must you not decuple?
must they not decuple? 	must I not be decupling?
must you not be decupling?
must she not be decupling?
must we not be decupling?
must you not be decupling?
must they not be decupling? 	must I not have decupled?
must you not have decupled?
must she not have decupled?
must we not have decupled?
must you not have decupled?
must they not have decupled? 	must I not have been decupling?
must you not have been decupling?
must she not have been decupling?
must we not have been decupling?
must you not have been decupling?
must they not have been decupling?