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 must not mass
you must not mass
she must not mass
we must not mass
you must not mass
they must not mass 	I must not be massing
you must not be massing
she must not be massing
we must not be massing
you must not be massing
they must not be massing	I must not have massed
you must not have massed
she must not have massed
we must not have massed
you must not have massed
they must not have massed	I must not have been massing
you must not have been massing
she must not have been massing
we must not have been massing
you must not have been massing
they must not 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 	
must I not mass?
must you not mass?
must she not mass?
must we not mass?
must you not mass?
must they not mass? 	must I not be massing?
must you not be massing?
must she not be massing?
must we not be massing?
must you not be massing?
must they not be massing? 	must I not have massed?
must you not have massed?
must she not have massed?
must we not have massed?
must you not have massed?
must they not have massed? 	must I not have been massing?
must you not have been massing?
must she not have been massing?
must we not have been massing?
must you not have been massing?
must they not have been massing?