English verb conjugation
MUST SPRING

Irregular verb: spring - sprang, sprung - sprung

Affirmation

Simple form	V-ing form
I must spring you must spring he must spring we must spring you must spring they must spring	I must be springing you must be springing he must be springing we must be springing you must be springing they must be springing
Perfect	V-ing perfect
I must have sprung you must have sprung he must have sprung we must have sprung you must have sprung they must have sprung	I must have been springing you must have been springing he must have been springing we must have been springing you must have been springing they must have been springing

Negation

Simple form	V-ing form
I must not spring you must not spring he must not spring we must not spring you must not spring they must not spring	I must not be springing you must not be springing he must not be springing we must not be springing you must not be springing they must not be springing
Perfect	V-ing perfect
I must not have sprung you must not have sprung he must not have sprung we must not have sprung you must not have sprung they must not have sprung	I must not have been springing you must not have been springing he must not have been springing we must not have been springing you must not have been springing they must not have been springing

Interrogative form

Simple form	V-ing form
must I spring? must you spring? must he spring? must we spring? must you spring? must they spring?	must I be springing? must you be springing? must he be springing? must we be springing? must you be springing? must they be springing?
Perfect	V-ing perfect
must I have sprung? must you have sprung? must he have sprung? must we have sprung? must you have sprung? must they have sprung?	must I have been springing? must you have been springing? must he have been springing? must we have been springing? must you have been springing? must they have been springing?

Interro-negative form

Simple form	V-ing form
must I not spring? must you not spring? must he not spring? must we not spring? must you not spring? must they not spring?	must I not be springing? must you not be springing? must he not be springing? must we not be springing? must you not be springing? must they not be springing?
Perfect	V-ing perfect
must I not have sprung? must you not have sprung? must he not have sprung? must we not have sprung? must you not have sprung? must they not have sprung?	must I not have been springing? must you not have been springing? must he not have been springing? must we not have been springing? must you not have been springing? must they not have been springing?