English verb conjugation
MUST HORN

Regular verb: horn - horned - horned

Affirmation

Simple form	V-ing form
I must horn you must horn he must horn we must horn you must horn they must horn	I must be horning you must be horning he 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 he 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 he 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 mustn't horn you mustn't horn he mustn't horn we mustn't horn you mustn't horn they mustn't horn	I mustn't be horning you mustn't be horning he mustn't be horning we mustn't be horning you mustn't be horning they mustn't be horning
Perfect	V-ing perfect
I mustn't have horned you mustn't have horned he mustn't have horned we mustn't have horned you mustn't have horned they mustn't have horned	I mustn't have been horning you mustn't have been horning he mustn't have been horning we mustn't have been horning you mustn't have been horning they mustn't have been horning

Interrogative form

Simple form	V-ing form
must I horn? must you horn? must he horn? must we horn? must you horn? must they horn?	must I be horning? must you be horning? must he 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 he 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 he 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
mustn't I horn? mustn't you horn? mustn't he horn? mustn't we horn? mustn't you horn? mustn't they horn?	mustn't I be horning? mustn't you be horning? mustn't he be horning? mustn't we be horning? mustn't you be horning? mustn't they be horning?
Perfect	V-ing perfect
mustn't I have horned? mustn't you have horned? mustn't he have horned? mustn't we have horned? mustn't you have horned? mustn't they have horned?	mustn't I have been horning? mustn't you have been horning? mustn't he have been horning? mustn't we have been horning? mustn't you have been horning? mustn't they have been horning?