must decrepitate
Verbe régulier : decrepitate - decrepitated- decrepitated

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must decrepitate
you must decrepitate
she must decrepitate
we must decrepitate
you must decrepitate
they must decrepitate 	I must be decrepitating
you must be decrepitating
she must be decrepitating
we must be decrepitating
you must be decrepitating
they must be decrepitating	I must have decrepitated
you must have decrepitated
she must have decrepitated
we must have decrepitated
you must have decrepitated
they must have decrepitated	I must have been decrepitating
you must have been decrepitating
she must have been decrepitating
we must have been decrepitating
you must have been decrepitating
they must have been decrepitating	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't decrepitate
you mustn't decrepitate
she mustn't decrepitate
we mustn't decrepitate
you mustn't decrepitate
they mustn't decrepitate 	I mustn't be decrepitating
you mustn't be decrepitating
she mustn't be decrepitating
we mustn't be decrepitating
you mustn't be decrepitating
they mustn't be decrepitating	I mustn't have decrepitated
you mustn't have decrepitated
she mustn't have decrepitated
we mustn't have decrepitated
you mustn't have decrepitated
they mustn't have decrepitated	I mustn't have been decrepitating
you mustn't have been decrepitating
she mustn't have been decrepitating
we mustn't have been decrepitating
you mustn't have been decrepitating
they mustn't have been decrepitating	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I decrepitate?
must you decrepitate?
must she decrepitate?
must we decrepitate?
must you decrepitate?
must they decrepitate? 	must I be decrepitating?
must you be decrepitating?
must she be decrepitating?
must we be decrepitating?
must you be decrepitating?
must they be decrepitating? 	must I have decrepitated?
must you have decrepitated?
must she have decrepitated?
must we have decrepitated?
must you have decrepitated?
must they have decrepitated? 	must I have been decrepitating?
must you have been decrepitating?
must she have been decrepitating?
must we have been decrepitating?
must you have been decrepitating?
must they have been decrepitating? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I decrepitate?
mustn't you decrepitate?
mustn't she decrepitate?
mustn't we decrepitate?
mustn't you decrepitate?
mustn't they decrepitate? 	mustn't I be decrepitating?
mustn't you be decrepitating?
mustn't she be decrepitating?
mustn't we be decrepitating?
mustn't you be decrepitating?
mustn't they be decrepitating? 	mustn't I have decrepitated?
mustn't you have decrepitated?
mustn't she have decrepitated?
mustn't we have decrepitated?
mustn't you have decrepitated?
mustn't they have decrepitated? 	mustn't I have been decrepitating?
mustn't you have been decrepitating?
mustn't she have been decrepitating?
mustn't we have been decrepitating?
mustn't you have been decrepitating?
mustn't they have been decrepitating?