Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must mar mar you must mar mar he must mar mar we must mar mar you must mar mar they must mar mar
V-ing form
I must be mar maring you must be mar maring he must be mar maring we must be mar maring you must be mar maring they must be mar maring
Perfect
I must have mar mared you must have mar mared he must have mar mared we must have mar mared you must have mar mared they must have mar mared
V-ing perfect
I must have been mar maring you must have been mar maring he must have been mar maring we must have been mar maring you must have been mar maring they must have been mar maring
Negation
Simple form
I mustn't mar mar you mustn't mar mar he mustn't mar mar we mustn't mar mar you mustn't mar mar they mustn't mar mar
V-ing form
I mustn't be mar maring you mustn't be mar maring he mustn't be mar maring we mustn't be mar maring you mustn't be mar maring they mustn't be mar maring
Perfect
I mustn't have mar mared you mustn't have mar mared he mustn't have mar mared we mustn't have mar mared you mustn't have mar mared they mustn't have mar mared
V-ing perfect
I mustn't have been mar maring you mustn't have been mar maring he mustn't have been mar maring we mustn't have been mar maring you mustn't have been mar maring they mustn't have been mar maring
Interrogative form
Simple form
must I mar mar? must you mar mar? must he mar mar? must we mar mar? must you mar mar? must they mar mar?
V-ing form
must I be mar maring? must you be mar maring? must he be mar maring? must we be mar maring? must you be mar maring? must they be mar maring?
Perfect
must I have mar mared? must you have mar mared? must he have mar mared? must we have mar mared? must you have mar mared? must they have mar mared?
V-ing perfect
must I have been mar maring? must you have been mar maring? must he have been mar maring? must we have been mar maring? must you have been mar maring? must they have been mar maring?
Interro-negative form
Simple form
mustn't I mar mar? mustn't you mar mar? mustn't he mar mar? mustn't we mar mar? mustn't you mar mar? mustn't they mar mar?
V-ing form
mustn't I be mar maring? mustn't you be mar maring? mustn't he be mar maring? mustn't we be mar maring? mustn't you be mar maring? mustn't they be mar maring?
Perfect
mustn't I have mar mared? mustn't you have mar mared? mustn't he have mar mared? mustn't we have mar mared? mustn't you have mar mared? mustn't they have mar mared?
V-ing perfect
mustn't I have been mar maring? mustn't you have been mar maring? mustn't he have been mar maring? mustn't we have been mar maring? mustn't you have been mar maring? mustn't they have been mar maring?