English verb conjugation
MUST UPSPRING

Irregular verb: upspring - upsprang, upsprung - upsprung

Affirmation

Simple form	V-ing form
I must upspring you must upspring he must upspring we must upspring you must upspring they must upspring	I must be upspringing you must be upspringing he must be upspringing we must be upspringing you must be upspringing they must be upspringing
Perfect	V-ing perfect
I must have upsprung you must have upsprung he must have upsprung we must have upsprung you must have upsprung they must have upsprung	I must have been upspringing you must have been upspringing he must have been upspringing we must have been upspringing you must have been upspringing they must have been upspringing

Negation

Simple form	V-ing form
I must not upspring you must not upspring he must not upspring we must not upspring you must not upspring they must not upspring	I must not be upspringing you must not be upspringing he must not be upspringing we must not be upspringing you must not be upspringing they must not be upspringing
Perfect	V-ing perfect
I must not have upsprung you must not have upsprung he must not have upsprung we must not have upsprung you must not have upsprung they must not have upsprung	I must not have been upspringing you must not have been upspringing he must not have been upspringing we must not have been upspringing you must not have been upspringing they must not have been upspringing

Interrogative form

Simple form	V-ing form
must I upspring? must you upspring? must he upspring? must we upspring? must you upspring? must they upspring?	must I be upspringing? must you be upspringing? must he be upspringing? must we be upspringing? must you be upspringing? must they be upspringing?
Perfect	V-ing perfect
must I have upsprung? must you have upsprung? must he have upsprung? must we have upsprung? must you have upsprung? must they have upsprung?	must I have been upspringing? must you have been upspringing? must he have been upspringing? must we have been upspringing? must you have been upspringing? must they have been upspringing?

Interro-negative form

Simple form	V-ing form
must I not upspring? must you not upspring? must he not upspring? must we not upspring? must you not upspring? must they not upspring?	must I not be upspringing? must you not be upspringing? must he not be upspringing? must we not be upspringing? must you not be upspringing? must they not be upspringing?
Perfect	V-ing perfect
must I not have upsprung? must you not have upsprung? must he not have upsprung? must we not have upsprung? must you not have upsprung? must they not have upsprung?	must I not have been upspringing? must you not have been upspringing? must he not have been upspringing? must we not have been upspringing? must you not have been upspringing? must they not have been upspringing?