must retrograde
Verbe régulier : retrograde - retrograded- retrograded
Traduction française : rétrograder (US) - battre en retraite 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must retrograde
you must retrograde
he must retrograde
we must retrograde
you must retrograde
they must retrograde 	I must be retrograding
you must be retrograding
he must be retrograding
we must be retrograding
you must be retrograding
they must be retrograding	I must have retrograded
you must have retrograded
he must have retrograded
we must have retrograded
you must have retrograded
they must have retrograded	I must have been retrograding
you must have been retrograding
he must have been retrograding
we must have been retrograding
you must have been retrograding
they must have been retrograding	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not retrograde
you must not retrograde
he must not retrograde
we must not retrograde
you must not retrograde
they must not retrograde 	I must not be retrograding
you must not be retrograding
he must not be retrograding
we must not be retrograding
you must not be retrograding
they must not be retrograding	I must not have retrograded
you must not have retrograded
he must not have retrograded
we must not have retrograded
you must not have retrograded
they must not have retrograded	I must not have been retrograding
you must not have been retrograding
he must not have been retrograding
we must not have been retrograding
you must not have been retrograding
they must not have been retrograding	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I retrograde?
must you retrograde?
must he retrograde?
must we retrograde?
must you retrograde?
must they retrograde? 	must I be retrograding?
must you be retrograding?
must he be retrograding?
must we be retrograding?
must you be retrograding?
must they be retrograding? 	must I have retrograded?
must you have retrograded?
must he have retrograded?
must we have retrograded?
must you have retrograded?
must they have retrograded? 	must I have been retrograding?
must you have been retrograding?
must he have been retrograding?
must we have been retrograding?
must you have been retrograding?
must they have been retrograding? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not retrograde?
must you not retrograde?
must he not retrograde?
must we not retrograde?
must you not retrograde?
must they not retrograde? 	must I not be retrograding?
must you not be retrograding?
must he not be retrograding?
must we not be retrograding?
must you not be retrograding?
must they not be retrograding? 	must I not have retrograded?
must you not have retrograded?
must he not have retrograded?
must we not have retrograded?
must you not have retrograded?
must they not have retrograded? 	must I not have been retrograding?
must you not have been retrograding?
must he not have been retrograding?
must we not have been retrograding?
must you not have been retrograding?
must they not have been retrograding?