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 mustn't upspring you mustn't upspring he mustn't upspring we mustn't upspring you mustn't upspring they mustn't upspring	I mustn't be upspringing you mustn't be upspringing he mustn't be upspringing we mustn't be upspringing you mustn't be upspringing they mustn't be upspringing
Perfect	V-ing perfect
I mustn't have upsprung you mustn't have upsprung he mustn't have upsprung we mustn't have upsprung you mustn't have upsprung they mustn't have upsprung	I mustn't have been upspringing you mustn't have been upspringing he mustn't have been upspringing we mustn't have been upspringing you mustn't have been upspringing they mustn't 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
mustn't I upspring? mustn't you upspring? mustn't he upspring? mustn't we upspring? mustn't you upspring? mustn't they upspring?	mustn't I be upspringing? mustn't you be upspringing? mustn't he be upspringing? mustn't we be upspringing? mustn't you be upspringing? mustn't they be upspringing?
Perfect	V-ing perfect
mustn't I have upsprung? mustn't you have upsprung? mustn't he have upsprung? mustn't we have upsprung? mustn't you have upsprung? mustn't they have upsprung?	mustn't I have been upspringing? mustn't you have been upspringing? mustn't he have been upspringing? mustn't we have been upspringing? mustn't you have been upspringing? mustn't they have been upspringing?