English verb conjugation
MUST HORN

Regular verb: horn - horned - horned

Affirmation

Simple form	V-ing form
I must horn you must horn she must horn we must horn you must horn they must horn	I must be horning you must be horning she must be horning we must be horning you must be horning they must be horning
Perfect	V-ing perfect
I must have horned you must have horned she must have horned we must have horned you must have horned they must have horned	I must have been horning you must have been horning she must have been horning we must have been horning you must have been horning they must have been horning

Negation

Simple form	V-ing form
I must not horn you must not horn she must not horn we must not horn you must not horn they must not horn	I must not be horning you must not be horning she must not be horning we must not be horning you must not be horning they must not be horning
Perfect	V-ing perfect
I must not have horned you must not have horned she must not have horned we must not have horned you must not have horned they must not have horned	I must not have been horning you must not have been horning she must not have been horning we must not have been horning you must not have been horning they must not have been horning

Interrogative form

Simple form	V-ing form
must I horn? must you horn? must she horn? must we horn? must you horn? must they horn?	must I be horning? must you be horning? must she be horning? must we be horning? must you be horning? must they be horning?
Perfect	V-ing perfect
must I have horned? must you have horned? must she have horned? must we have horned? must you have horned? must they have horned?	must I have been horning? must you have been horning? must she have been horning? must we have been horning? must you have been horning? must they have been horning?

Interro-negative form

Simple form	V-ing form
must I not horn? must you not horn? must she not horn? must we not horn? must you not horn? must they not horn?	must I not be horning? must you not be horning? must she not be horning? must we not be horning? must you not be horning? must they not be horning?
Perfect	V-ing perfect
must I not have horned? must you not have horned? must she not have horned? must we not have horned? must you not have horned? must they not have horned?	must I not have been horning? must you not have been horning? must she not have been horning? must we not have been horning? must you not have been horning? must they not have been horning?