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
he must secern
we must secern
you must secern
they must secern 	I must be secerning
you must be secerning
he must be secerning
we must be secerning
you must be secerning
they must be secerning	I must have secerned
you must have secerned
he 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
he 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 must not secern
you must not secern
he must not secern
we must not secern
you must not secern
they must not secern 	I must not be secerning
you must not be secerning
he must not be secerning
we must not be secerning
you must not be secerning
they must not be secerning	I must not have secerned
you must not have secerned
he must not have secerned
we must not have secerned
you must not have secerned
they must not have secerned	I must not have been secerning
you must not have been secerning
he must not have been secerning
we must not have been secerning
you must not have been secerning
they must not have been secerning	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I secern?
must you secern?
must he secern?
must we secern?
must you secern?
must they secern? 	must I be secerning?
must you be secerning?
must he be secerning?
must we be secerning?
must you be secerning?
must they be secerning? 	must I have secerned?
must you have secerned?
must he 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 he 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 	
must I not secern?
must you not secern?
must he not secern?
must we not secern?
must you not secern?
must they not secern? 	must I not be secerning?
must you not be secerning?
must he not be secerning?
must we not be secerning?
must you not be secerning?
must they not be secerning? 	must I not have secerned?
must you not have secerned?
must he not have secerned?
must we not have secerned?
must you not have secerned?
must they not have secerned? 	must I not have been secerning?
must you not have been secerning?
must he not have been secerning?
must we not have been secerning?
must you not have been secerning?
must they not have been secerning?