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 mustn't discern you mustn't discern he mustn't discern we mustn't discern you mustn't discern they mustn't discern	I mustn't be discerning you mustn't be discerning he mustn't be discerning we mustn't be discerning you mustn't be discerning they mustn't be discerning
Perfect	V-ing perfect
I mustn't have discerned you mustn't have discerned he mustn't have discerned we mustn't have discerned you mustn't have discerned they mustn't have discerned	I mustn't have been discerning you mustn't have been discerning he mustn't have been discerning we mustn't have been discerning you mustn't have been discerning they mustn't 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
mustn't I discern? mustn't you discern? mustn't he discern? mustn't we discern? mustn't you discern? mustn't they discern?	mustn't I be discerning? mustn't you be discerning? mustn't he be discerning? mustn't we be discerning? mustn't you be discerning? mustn't they be discerning?
Perfect	V-ing perfect
mustn't I have discerned? mustn't you have discerned? mustn't he have discerned? mustn't we have discerned? mustn't you have discerned? mustn't they have discerned?	mustn't I have been discerning? mustn't you have been discerning? mustn't he have been discerning? mustn't we have been discerning? mustn't you have been discerning? mustn't they have been discerning?