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 must not dun you must not dun he must not dun we must not dun you must not dun they must not dun	I must not be dunning you must not be dunning he must not be dunning we must not be dunning you must not be dunning they must not be dunning
Perfect	V-ing perfect
I must not have dunned you must not have dunned he must not have dunned we must not have dunned you must not have dunned they must not have dunned	I must not have been dunning you must not have been dunning he must not have been dunning we must not have been dunning you must not have been dunning they must not 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
must I not dun? must you not dun? must he not dun? must we not dun? must you not dun? must they not dun?	must I not be dunning? must you not be dunning? must he not be dunning? must we not be dunning? must you not be dunning? must they not be dunning?
Perfect	V-ing perfect
must I not have dunned? must you not have dunned? must he not have dunned? must we not have dunned? must you not have dunned? must they not have dunned?	must I not have been dunning? must you not have been dunning? must he not have been dunning? must we not have been dunning? must you not have been dunning? must they not have been dunning?