Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must gab gab you must gab gab he must gab gab we must gab gab you must gab gab they must gab gab
V-ing form
I must be gab gabing you must be gab gabing he must be gab gabing we must be gab gabing you must be gab gabing they must be gab gabing
Perfect
I must have gab gabed you must have gab gabed he must have gab gabed we must have gab gabed you must have gab gabed they must have gab gabed
V-ing perfect
I must have been gab gabing you must have been gab gabing he must have been gab gabing we must have been gab gabing you must have been gab gabing they must have been gab gabing
Negation
Simple form
I must not gab gab you must not gab gab he must not gab gab we must not gab gab you must not gab gab they must not gab gab
V-ing form
I must not be gab gabing you must not be gab gabing he must not be gab gabing we must not be gab gabing you must not be gab gabing they must not be gab gabing
Perfect
I must not have gab gabed you must not have gab gabed he must not have gab gabed we must not have gab gabed you must not have gab gabed they must not have gab gabed
V-ing perfect
I must not have been gab gabing you must not have been gab gabing he must not have been gab gabing we must not have been gab gabing you must not have been gab gabing they must not have been gab gabing
Interrogative form
Simple form
must I gab gab? must you gab gab? must he gab gab? must we gab gab? must you gab gab? must they gab gab?
V-ing form
must I be gab gabing? must you be gab gabing? must he be gab gabing? must we be gab gabing? must you be gab gabing? must they be gab gabing?
Perfect
must I have gab gabed? must you have gab gabed? must he have gab gabed? must we have gab gabed? must you have gab gabed? must they have gab gabed?
V-ing perfect
must I have been gab gabing? must you have been gab gabing? must he have been gab gabing? must we have been gab gabing? must you have been gab gabing? must they have been gab gabing?
Interro-negative form
Simple form
must I not gab gab? must you not gab gab? must he not gab gab? must we not gab gab? must you not gab gab? must they not gab gab?
V-ing form
must I not be gab gabing? must you not be gab gabing? must he not be gab gabing? must we not be gab gabing? must you not be gab gabing? must they not be gab gabing?
Perfect
must I not have gab gabed? must you not have gab gabed? must he not have gab gabed? must we not have gab gabed? must you not have gab gabed? must they not have gab gabed?
V-ing perfect
must I not have been gab gabing? must you not have been gab gabing? must he not have been gab gabing? must we not have been gab gabing? must you not have been gab gabing? must they not have been gab gabing?