must regress
Verbe régulier : regress - regressed- regressed
Traduction française : régresser - reculer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must regress
you must regress
he must regress
we must regress
you must regress
they must regress 	I must be regressing
you must be regressing
he must be regressing
we must be regressing
you must be regressing
they must be regressing	I must have regressed
you must have regressed
he must have regressed
we must have regressed
you must have regressed
they must have regressed	I must have been regressing
you must have been regressing
he must have been regressing
we must have been regressing
you must have been regressing
they must have been regressing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't regress
you mustn't regress
he mustn't regress
we mustn't regress
you mustn't regress
they mustn't regress 	I mustn't be regressing
you mustn't be regressing
he mustn't be regressing
we mustn't be regressing
you mustn't be regressing
they mustn't be regressing	I mustn't have regressed
you mustn't have regressed
he mustn't have regressed
we mustn't have regressed
you mustn't have regressed
they mustn't have regressed	I mustn't have been regressing
you mustn't have been regressing
he mustn't have been regressing
we mustn't have been regressing
you mustn't have been regressing
they mustn't have been regressing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I regress?
must you regress?
must he regress?
must we regress?
must you regress?
must they regress? 	must I be regressing?
must you be regressing?
must he be regressing?
must we be regressing?
must you be regressing?
must they be regressing? 	must I have regressed?
must you have regressed?
must he have regressed?
must we have regressed?
must you have regressed?
must they have regressed? 	must I have been regressing?
must you have been regressing?
must he have been regressing?
must we have been regressing?
must you have been regressing?
must they have been regressing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I regress?
mustn't you regress?
mustn't he regress?
mustn't we regress?
mustn't you regress?
mustn't they regress? 	mustn't I be regressing?
mustn't you be regressing?
mustn't he be regressing?
mustn't we be regressing?
mustn't you be regressing?
mustn't they be regressing? 	mustn't I have regressed?
mustn't you have regressed?
mustn't he have regressed?
mustn't we have regressed?
mustn't you have regressed?
mustn't they have regressed? 	mustn't I have been regressing?
mustn't you have been regressing?
mustn't he have been regressing?
mustn't we have been regressing?
mustn't you have been regressing?
mustn't they have been regressing?