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