must preobtain
Verbe régulier : preobtain - preobtained- preobtained

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must preobtain
you must preobtain
he must preobtain
we must preobtain
you must preobtain
they must preobtain 	I must be preobtaining
you must be preobtaining
he must be preobtaining
we must be preobtaining
you must be preobtaining
they must be preobtaining	I must have preobtained
you must have preobtained
he must have preobtained
we must have preobtained
you must have preobtained
they must have preobtained	I must have been preobtaining
you must have been preobtaining
he must have been preobtaining
we must have been preobtaining
you must have been preobtaining
they must have been preobtaining	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't preobtain
you mustn't preobtain
he mustn't preobtain
we mustn't preobtain
you mustn't preobtain
they mustn't preobtain 	I mustn't be preobtaining
you mustn't be preobtaining
he mustn't be preobtaining
we mustn't be preobtaining
you mustn't be preobtaining
they mustn't be preobtaining	I mustn't have preobtained
you mustn't have preobtained
he mustn't have preobtained
we mustn't have preobtained
you mustn't have preobtained
they mustn't have preobtained	I mustn't have been preobtaining
you mustn't have been preobtaining
he mustn't have been preobtaining
we mustn't have been preobtaining
you mustn't have been preobtaining
they mustn't have been preobtaining	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I preobtain?
must you preobtain?
must he preobtain?
must we preobtain?
must you preobtain?
must they preobtain? 	must I be preobtaining?
must you be preobtaining?
must he be preobtaining?
must we be preobtaining?
must you be preobtaining?
must they be preobtaining? 	must I have preobtained?
must you have preobtained?
must he have preobtained?
must we have preobtained?
must you have preobtained?
must they have preobtained? 	must I have been preobtaining?
must you have been preobtaining?
must he have been preobtaining?
must we have been preobtaining?
must you have been preobtaining?
must they have been preobtaining? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I preobtain?
mustn't you preobtain?
mustn't he preobtain?
mustn't we preobtain?
mustn't you preobtain?
mustn't they preobtain? 	mustn't I be preobtaining?
mustn't you be preobtaining?
mustn't he be preobtaining?
mustn't we be preobtaining?
mustn't you be preobtaining?
mustn't they be preobtaining? 	mustn't I have preobtained?
mustn't you have preobtained?
mustn't he have preobtained?
mustn't we have preobtained?
mustn't you have preobtained?
mustn't they have preobtained? 	mustn't I have been preobtaining?
mustn't you have been preobtaining?
mustn't he have been preobtaining?
mustn't we have been preobtaining?
mustn't you have been preobtaining?
mustn't they have been preobtaining?