should retrogress
Verbe régulier : retrogress - retrogressed- retrogressed
Traduction française : régresser - rétrograder 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I'd retrogress
you'd retrogress
he'd retrogress
we'd retrogress
you'd retrogress
they'd retrogress 	I'd be retrogressing
you'd be retrogressing
he'd be retrogressing
we'd be retrogressing
you'd be retrogressing
they'd be retrogressing	I should've retrogressed
you should've retrogressed
he should've retrogressed
we should've retrogressed
you should've retrogressed
they should've retrogressed	I should've been retrogressing
you should've been retrogressing
he should've been retrogressing
we should've been retrogressing
you should've been retrogressing
they should've been retrogressing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I shouldn't retrogress
you shouldn't retrogress
he shouldn't retrogress
we shouldn't retrogress
you shouldn't retrogress
they shouldn't retrogress 	I shouldn't be retrogressing
you shouldn't be retrogressing
he shouldn't be retrogressing
we shouldn't be retrogressing
you shouldn't be retrogressing
they shouldn't be retrogressing	I shouldn't have retrogressed
you shouldn't have retrogressed
he shouldn't have retrogressed
we shouldn't have retrogressed
you shouldn't have retrogressed
they shouldn't have retrogressed	I shouldn't have been retrogressing
you shouldn't have been retrogressing
he shouldn't have been retrogressing
we shouldn't have been retrogressing
you shouldn't have been retrogressing
they shouldn't have been retrogressing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
should I retrogress?
should you retrogress?
should he retrogress?
should we retrogress?
should you retrogress?
should they retrogress? 	should I be retrogressing?
should you be retrogressing?
should he be retrogressing?
should we be retrogressing?
should you be retrogressing?
should they be retrogressing? 	should I have retrogressed?
should you have retrogressed?
should he have retrogressed?
should we have retrogressed?
should you have retrogressed?
should they have retrogressed? 	should I have been retrogressing?
should you have been retrogressing?
should he have been retrogressing?
should we have been retrogressing?
should you have been retrogressing?
should they have been retrogressing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
shouldn't I retrogress?
shouldn't you retrogress?
shouldn't he retrogress?
shouldn't we retrogress?
shouldn't you retrogress?
shouldn't they retrogress? 	shouldn't I be retrogressing?
shouldn't you be retrogressing?
shouldn't he be retrogressing?
shouldn't we be retrogressing?
shouldn't you be retrogressing?
shouldn't they be retrogressing? 	shouldn't I have retrogressed?
shouldn't you have retrogressed?
shouldn't he have retrogressed?
shouldn't we have retrogressed?
shouldn't you have retrogressed?
shouldn't they have retrogressed? 	shouldn't I have been retrogressing?
shouldn't you have been retrogressing?
shouldn't he have been retrogressing?
shouldn't we have been retrogressing?
shouldn't you have been retrogressing?
shouldn't they have been retrogressing?