English verb conjugation
MUST TUN

Regular verb: tun - tuned - tuned

Affirmation

Simple form	V-ing form
I must tun you must tun he must tun we must tun you must tun they must tun	I must be tuning you must be tuning he must be tuning we must be tuning you must be tuning they must be tuning
Perfect	V-ing perfect
I must have tuned you must have tuned he must have tuned we must have tuned you must have tuned they must have tuned	I must have been tuning you must have been tuning he must have been tuning we must have been tuning you must have been tuning they must have been tuning

Negation

Simple form	V-ing form
I mustn't tun you mustn't tun he mustn't tun we mustn't tun you mustn't tun they mustn't tun	I mustn't be tuning you mustn't be tuning he mustn't be tuning we mustn't be tuning you mustn't be tuning they mustn't be tuning
Perfect	V-ing perfect
I mustn't have tuned you mustn't have tuned he mustn't have tuned we mustn't have tuned you mustn't have tuned they mustn't have tuned	I mustn't have been tuning you mustn't have been tuning he mustn't have been tuning we mustn't have been tuning you mustn't have been tuning they mustn't have been tuning

Interrogative form

Simple form	V-ing form
must I tun? must you tun? must he tun? must we tun? must you tun? must they tun?	must I be tuning? must you be tuning? must he be tuning? must we be tuning? must you be tuning? must they be tuning?
Perfect	V-ing perfect
must I have tuned? must you have tuned? must he have tuned? must we have tuned? must you have tuned? must they have tuned?	must I have been tuning? must you have been tuning? must he have been tuning? must we have been tuning? must you have been tuning? must they have been tuning?

Interro-negative form

Simple form	V-ing form
mustn't I tun? mustn't you tun? mustn't he tun? mustn't we tun? mustn't you tun? mustn't they tun?	mustn't I be tuning? mustn't you be tuning? mustn't he be tuning? mustn't we be tuning? mustn't you be tuning? mustn't they be tuning?
Perfect	V-ing perfect
mustn't I have tuned? mustn't you have tuned? mustn't he have tuned? mustn't we have tuned? mustn't you have tuned? mustn't they have tuned?	mustn't I have been tuning? mustn't you have been tuning? mustn't he have been tuning? mustn't we have been tuning? mustn't you have been tuning? mustn't they have been tuning?