must umber
Verbe régulier : umber - umbered- umbered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must umber
you must umber
she must umber
we must umber
you must umber
they must umber 	I must be umbering
you must be umbering
she must be umbering
we must be umbering
you must be umbering
they must be umbering	I must have umbered
you must have umbered
she must have umbered
we must have umbered
you must have umbered
they must have umbered	I must have been umbering
you must have been umbering
she must have been umbering
we must have been umbering
you must have been umbering
they must have been umbering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't umber
you mustn't umber
she mustn't umber
we mustn't umber
you mustn't umber
they mustn't umber 	I mustn't be umbering
you mustn't be umbering
she mustn't be umbering
we mustn't be umbering
you mustn't be umbering
they mustn't be umbering	I mustn't have umbered
you mustn't have umbered
she mustn't have umbered
we mustn't have umbered
you mustn't have umbered
they mustn't have umbered	I mustn't have been umbering
you mustn't have been umbering
she mustn't have been umbering
we mustn't have been umbering
you mustn't have been umbering
they mustn't have been umbering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I umber?
must you umber?
must she umber?
must we umber?
must you umber?
must they umber? 	must I be umbering?
must you be umbering?
must she be umbering?
must we be umbering?
must you be umbering?
must they be umbering? 	must I have umbered?
must you have umbered?
must she have umbered?
must we have umbered?
must you have umbered?
must they have umbered? 	must I have been umbering?
must you have been umbering?
must she have been umbering?
must we have been umbering?
must you have been umbering?
must they have been umbering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I umber?
mustn't you umber?
mustn't she umber?
mustn't we umber?
mustn't you umber?
mustn't they umber? 	mustn't I be umbering?
mustn't you be umbering?
mustn't she be umbering?
mustn't we be umbering?
mustn't you be umbering?
mustn't they be umbering? 	mustn't I have umbered?
mustn't you have umbered?
mustn't she have umbered?
mustn't we have umbered?
mustn't you have umbered?
mustn't they have umbered? 	mustn't I have been umbering?
mustn't you have been umbering?
mustn't she have been umbering?
mustn't we have been umbering?
mustn't you have been umbering?
mustn't they have been umbering?