must retain
Verbe régulier : retain - retained- retained

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must retain
you must retain
she must retain
we must retain
you must retain
they must retain 	I must be retaining
you must be retaining
she must be retaining
we must be retaining
you must be retaining
they must be retaining	I must have retained
you must have retained
she must have retained
we must have retained
you must have retained
they must have retained	I must have been retaining
you must have been retaining
she must have been retaining
we must have been retaining
you must have been retaining
they must have been retaining	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't retain
you mustn't retain
she mustn't retain
we mustn't retain
you mustn't retain
they mustn't retain 	I mustn't be retaining
you mustn't be retaining
she mustn't be retaining
we mustn't be retaining
you mustn't be retaining
they mustn't be retaining	I mustn't have retained
you mustn't have retained
she mustn't have retained
we mustn't have retained
you mustn't have retained
they mustn't have retained	I mustn't have been retaining
you mustn't have been retaining
she mustn't have been retaining
we mustn't have been retaining
you mustn't have been retaining
they mustn't have been retaining	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I retain?
must you retain?
must she retain?
must we retain?
must you retain?
must they retain? 	must I be retaining?
must you be retaining?
must she be retaining?
must we be retaining?
must you be retaining?
must they be retaining? 	must I have retained?
must you have retained?
must she have retained?
must we have retained?
must you have retained?
must they have retained? 	must I have been retaining?
must you have been retaining?
must she have been retaining?
must we have been retaining?
must you have been retaining?
must they have been retaining? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I retain?
mustn't you retain?
mustn't she retain?
mustn't we retain?
mustn't you retain?
mustn't they retain? 	mustn't I be retaining?
mustn't you be retaining?
mustn't she be retaining?
mustn't we be retaining?
mustn't you be retaining?
mustn't they be retaining? 	mustn't I have retained?
mustn't you have retained?
mustn't she have retained?
mustn't we have retained?
mustn't you have retained?
mustn't they have retained? 	mustn't I have been retaining?
mustn't you have been retaining?
mustn't she have been retaining?
mustn't we have been retaining?
mustn't you have been retaining?
mustn't they have been retaining?