must mass
Verbe régulier : mass - massed- massed
Traduction française : se masser - masser 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must mass
you must mass
she must mass
we must mass
you must mass
they must mass 	I must be massing
you must be massing
she must be massing
we must be massing
you must be massing
they must be massing	I must have massed
you must have massed
she must have massed
we must have massed
you must have massed
they must have massed	I must have been massing
you must have been massing
she must have been massing
we must have been massing
you must have been massing
they must have been massing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't mass
you mustn't mass
she mustn't mass
we mustn't mass
you mustn't mass
they mustn't mass 	I mustn't be massing
you mustn't be massing
she mustn't be massing
we mustn't be massing
you mustn't be massing
they mustn't be massing	I mustn't have massed
you mustn't have massed
she mustn't have massed
we mustn't have massed
you mustn't have massed
they mustn't have massed	I mustn't have been massing
you mustn't have been massing
she mustn't have been massing
we mustn't have been massing
you mustn't have been massing
they mustn't have been massing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I mass?
must you mass?
must she mass?
must we mass?
must you mass?
must they mass? 	must I be massing?
must you be massing?
must she be massing?
must we be massing?
must you be massing?
must they be massing? 	must I have massed?
must you have massed?
must she have massed?
must we have massed?
must you have massed?
must they have massed? 	must I have been massing?
must you have been massing?
must she have been massing?
must we have been massing?
must you have been massing?
must they have been massing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I mass?
mustn't you mass?
mustn't she mass?
mustn't we mass?
mustn't you mass?
mustn't they mass? 	mustn't I be massing?
mustn't you be massing?
mustn't she be massing?
mustn't we be massing?
mustn't you be massing?
mustn't they be massing? 	mustn't I have massed?
mustn't you have massed?
mustn't she have massed?
mustn't we have massed?
mustn't you have massed?
mustn't they have massed? 	mustn't I have been massing?
mustn't you have been massing?
mustn't she have been massing?
mustn't we have been massing?
mustn't you have been massing?
mustn't they have been massing?