English verb conjugation
MUST UPTURN

Regular verb: upturn - upturned - upturned

Affirmation

Simple form	V-ing form
I must upturn you must upturn he must upturn we must upturn you must upturn they must upturn	I must be upturning you must be upturning he must be upturning we must be upturning you must be upturning they must be upturning
Perfect	V-ing perfect
I must have upturned you must have upturned he must have upturned we must have upturned you must have upturned they must have upturned	I must have been upturning you must have been upturning he must have been upturning we must have been upturning you must have been upturning they must have been upturning

Negation

Simple form	V-ing form
I must not upturn you must not upturn he must not upturn we must not upturn you must not upturn they must not upturn	I must not be upturning you must not be upturning he must not be upturning we must not be upturning you must not be upturning they must not be upturning
Perfect	V-ing perfect
I must not have upturned you must not have upturned he must not have upturned we must not have upturned you must not have upturned they must not have upturned	I must not have been upturning you must not have been upturning he must not have been upturning we must not have been upturning you must not have been upturning they must not have been upturning

Interrogative form

Simple form	V-ing form
must I upturn? must you upturn? must he upturn? must we upturn? must you upturn? must they upturn?	must I be upturning? must you be upturning? must he be upturning? must we be upturning? must you be upturning? must they be upturning?
Perfect	V-ing perfect
must I have upturned? must you have upturned? must he have upturned? must we have upturned? must you have upturned? must they have upturned?	must I have been upturning? must you have been upturning? must he have been upturning? must we have been upturning? must you have been upturning? must they have been upturning?

Interro-negative form

Simple form	V-ing form
must I not upturn? must you not upturn? must he not upturn? must we not upturn? must you not upturn? must they not upturn?	must I not be upturning? must you not be upturning? must he not be upturning? must we not be upturning? must you not be upturning? must they not be upturning?
Perfect	V-ing perfect
must I not have upturned? must you not have upturned? must he not have upturned? must we not have upturned? must you not have upturned? must they not have upturned?	must I not have been upturning? must you not have been upturning? must he not have been upturning? must we not have been upturning? must you not have been upturning? must they not have been upturning?