English verb conjugation
MUST DISCERN

Regular verb: discern - discerned - discerned

Affirmation

Simple form	V-ing form
I must discern you must discern he must discern we must discern you must discern they must discern	I must be discerning you must be discerning he must be discerning we must be discerning you must be discerning they must be discerning
Perfect	V-ing perfect
I must have discerned you must have discerned he must have discerned we must have discerned you must have discerned they must have discerned	I must have been discerning you must have been discerning he must have been discerning we must have been discerning you must have been discerning they must have been discerning

Negation

Simple form	V-ing form
I must not discern you must not discern he must not discern we must not discern you must not discern they must not discern	I must not be discerning you must not be discerning he must not be discerning we must not be discerning you must not be discerning they must not be discerning
Perfect	V-ing perfect
I must not have discerned you must not have discerned he must not have discerned we must not have discerned you must not have discerned they must not have discerned	I must not have been discerning you must not have been discerning he must not have been discerning we must not have been discerning you must not have been discerning they must not have been discerning

Interrogative form

Simple form	V-ing form
must I discern? must you discern? must he discern? must we discern? must you discern? must they discern?	must I be discerning? must you be discerning? must he be discerning? must we be discerning? must you be discerning? must they be discerning?
Perfect	V-ing perfect
must I have discerned? must you have discerned? must he have discerned? must we have discerned? must you have discerned? must they have discerned?	must I have been discerning? must you have been discerning? must he have been discerning? must we have been discerning? must you have been discerning? must they have been discerning?

Interro-negative form

Simple form	V-ing form
must I not discern? must you not discern? must he not discern? must we not discern? must you not discern? must they not discern?	must I not be discerning? must you not be discerning? must he not be discerning? must we not be discerning? must you not be discerning? must they not be discerning?
Perfect	V-ing perfect
must I not have discerned? must you not have discerned? must he not have discerned? must we not have discerned? must you not have discerned? must they not have discerned?	must I not have been discerning? must you not have been discerning? must he not have been discerning? must we not have been discerning? must you not have been discerning? must they not have been discerning?