English verb conjugation
MUST SECERN

Regular verb: secern - secerned - secerned

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?