must preinform
Verbe régulier : preinform - preinformed- preinformed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must preinform
you must preinform
he must preinform
we must preinform
you must preinform
they must preinform 	I must be preinforming
you must be preinforming
he must be preinforming
we must be preinforming
you must be preinforming
they must be preinforming	I must have preinformed
you must have preinformed
he must have preinformed
we must have preinformed
you must have preinformed
they must have preinformed	I must have been preinforming
you must have been preinforming
he must have been preinforming
we must have been preinforming
you must have been preinforming
they must have been preinforming	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't preinform
you mustn't preinform
he mustn't preinform
we mustn't preinform
you mustn't preinform
they mustn't preinform 	I mustn't be preinforming
you mustn't be preinforming
he mustn't be preinforming
we mustn't be preinforming
you mustn't be preinforming
they mustn't be preinforming	I mustn't have preinformed
you mustn't have preinformed
he mustn't have preinformed
we mustn't have preinformed
you mustn't have preinformed
they mustn't have preinformed	I mustn't have been preinforming
you mustn't have been preinforming
he mustn't have been preinforming
we mustn't have been preinforming
you mustn't have been preinforming
they mustn't have been preinforming	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I preinform?
must you preinform?
must he preinform?
must we preinform?
must you preinform?
must they preinform? 	must I be preinforming?
must you be preinforming?
must he be preinforming?
must we be preinforming?
must you be preinforming?
must they be preinforming? 	must I have preinformed?
must you have preinformed?
must he have preinformed?
must we have preinformed?
must you have preinformed?
must they have preinformed? 	must I have been preinforming?
must you have been preinforming?
must he have been preinforming?
must we have been preinforming?
must you have been preinforming?
must they have been preinforming? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I preinform?
mustn't you preinform?
mustn't he preinform?
mustn't we preinform?
mustn't you preinform?
mustn't they preinform? 	mustn't I be preinforming?
mustn't you be preinforming?
mustn't he be preinforming?
mustn't we be preinforming?
mustn't you be preinforming?
mustn't they be preinforming? 	mustn't I have preinformed?
mustn't you have preinformed?
mustn't he have preinformed?
mustn't we have preinformed?
mustn't you have preinformed?
mustn't they have preinformed? 	mustn't I have been preinforming?
mustn't you have been preinforming?
mustn't he have been preinforming?
mustn't we have been preinforming?
mustn't you have been preinforming?
mustn't they have been preinforming?