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