English verb conjugation
MUST DUN

Regular verb: dun - dunned - dunned

Affirmation

Simple form	V-ing form
I must dun you must dun he must dun we must dun you must dun they must dun	I must be dunning you must be dunning he must be dunning we must be dunning you must be dunning they must be dunning
Perfect	V-ing perfect
I must have dunned you must have dunned he must have dunned we must have dunned you must have dunned they must have dunned	I must have been dunning you must have been dunning he must have been dunning we must have been dunning you must have been dunning they must have been dunning

Negation

Simple form	V-ing form
I mustn't dun you mustn't dun he mustn't dun we mustn't dun you mustn't dun they mustn't dun	I mustn't be dunning you mustn't be dunning he mustn't be dunning we mustn't be dunning you mustn't be dunning they mustn't be dunning
Perfect	V-ing perfect
I mustn't have dunned you mustn't have dunned he mustn't have dunned we mustn't have dunned you mustn't have dunned they mustn't have dunned	I mustn't have been dunning you mustn't have been dunning he mustn't have been dunning we mustn't have been dunning you mustn't have been dunning they mustn't have been dunning

Interrogative form

Simple form	V-ing form
must I dun? must you dun? must he dun? must we dun? must you dun? must they dun?	must I be dunning? must you be dunning? must he be dunning? must we be dunning? must you be dunning? must they be dunning?
Perfect	V-ing perfect
must I have dunned? must you have dunned? must he have dunned? must we have dunned? must you have dunned? must they have dunned?	must I have been dunning? must you have been dunning? must he have been dunning? must we have been dunning? must you have been dunning? must they have been dunning?

Interro-negative form

Simple form	V-ing form
mustn't I dun? mustn't you dun? mustn't he dun? mustn't we dun? mustn't you dun? mustn't they dun?	mustn't I be dunning? mustn't you be dunning? mustn't he be dunning? mustn't we be dunning? mustn't you be dunning? mustn't they be dunning?
Perfect	V-ing perfect
mustn't I have dunned? mustn't you have dunned? mustn't he have dunned? mustn't we have dunned? mustn't you have dunned? mustn't they have dunned?	mustn't I have been dunning? mustn't you have been dunning? mustn't he have been dunning? mustn't we have been dunning? mustn't you have been dunning? mustn't they have been dunning?