English verb conjugation
MUST SECERN

Regular verb: secern - secerned - secerned

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

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

Interro-negative form

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