must backdate
Verbe régulier : backdate - backdated- backdated
Traduction française : antidater 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must backdate
you must backdate
he must backdate
we must backdate
you must backdate
they must backdate 	I must be backdating
you must be backdating
he must be backdating
we must be backdating
you must be backdating
they must be backdating	I must have backdated
you must have backdated
he must have backdated
we must have backdated
you must have backdated
they must have backdated	I must have been backdating
you must have been backdating
he must have been backdating
we must have been backdating
you must have been backdating
they must have been backdating	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't backdate
you mustn't backdate
he mustn't backdate
we mustn't backdate
you mustn't backdate
they mustn't backdate 	I mustn't be backdating
you mustn't be backdating
he mustn't be backdating
we mustn't be backdating
you mustn't be backdating
they mustn't be backdating	I mustn't have backdated
you mustn't have backdated
he mustn't have backdated
we mustn't have backdated
you mustn't have backdated
they mustn't have backdated	I mustn't have been backdating
you mustn't have been backdating
he mustn't have been backdating
we mustn't have been backdating
you mustn't have been backdating
they mustn't have been backdating	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I backdate?
must you backdate?
must he backdate?
must we backdate?
must you backdate?
must they backdate? 	must I be backdating?
must you be backdating?
must he be backdating?
must we be backdating?
must you be backdating?
must they be backdating? 	must I have backdated?
must you have backdated?
must he have backdated?
must we have backdated?
must you have backdated?
must they have backdated? 	must I have been backdating?
must you have been backdating?
must he have been backdating?
must we have been backdating?
must you have been backdating?
must they have been backdating? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I backdate?
mustn't you backdate?
mustn't he backdate?
mustn't we backdate?
mustn't you backdate?
mustn't they backdate? 	mustn't I be backdating?
mustn't you be backdating?
mustn't he be backdating?
mustn't we be backdating?
mustn't you be backdating?
mustn't they be backdating? 	mustn't I have backdated?
mustn't you have backdated?
mustn't he have backdated?
mustn't we have backdated?
mustn't you have backdated?
mustn't they have backdated? 	mustn't I have been backdating?
mustn't you have been backdating?
mustn't he have been backdating?
mustn't we have been backdating?
mustn't you have been backdating?
mustn't they have been backdating?