must secern
Verbe régulier : secern - secerned- secerned

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must secern
you must secern
she must secern
we must secern
you must secern
they must secern 	I must be secerning
you must be secerning
she must be secerning
we must be secerning
you must be secerning
they must be secerning	I must have secerned
you must have secerned
she must have secerned
we must have secerned
you must have secerned
they must have secerned	I must have been secerning
you must have been secerning
she must have been secerning
we must have been secerning
you must have been secerning
they must have been secerning	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't secern
you mustn't secern
she mustn't secern
we mustn't secern
you mustn't secern
they mustn't secern 	I mustn't be secerning
you mustn't be secerning
she mustn't be secerning
we mustn't be secerning
you mustn't be secerning
they mustn't be secerning	I mustn't have secerned
you mustn't have secerned
she mustn't have secerned
we mustn't have secerned
you mustn't have secerned
they mustn't have secerned	I mustn't have been secerning
you mustn't have been secerning
she mustn't have been secerning
we mustn't have been secerning
you mustn't have been secerning
they mustn't have been secerning	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I secern?
must you secern?
must she secern?
must we secern?
must you secern?
must they secern? 	must I be secerning?
must you be secerning?
must she be secerning?
must we be secerning?
must you be secerning?
must they be secerning? 	must I have secerned?
must you have secerned?
must she have secerned?
must we have secerned?
must you have secerned?
must they have secerned? 	must I have been secerning?
must you have been secerning?
must she have been secerning?
must we have been secerning?
must you have been secerning?
must they have been secerning? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I secern?
mustn't you secern?
mustn't she secern?
mustn't we secern?
mustn't you secern?
mustn't they secern? 	mustn't I be secerning?
mustn't you be secerning?
mustn't she be secerning?
mustn't we be secerning?
mustn't you be secerning?
mustn't they be secerning? 	mustn't I have secerned?
mustn't you have secerned?
mustn't she have secerned?
mustn't we have secerned?
mustn't you have secerned?
mustn't they have secerned? 	mustn't I have been secerning?
mustn't you have been secerning?
mustn't she have been secerning?
mustn't we have been secerning?
mustn't you have been secerning?
mustn't they have been secerning?