English verb conjugation
MUST SPRING

Irregular verb: spring - sprang, sprung - sprung

Affirmation

Simple form	V-ing form
I must spring you must spring she must spring we must spring you must spring they must spring	I must be springing you must be springing she 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 she 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 she 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 mustn't spring you mustn't spring she mustn't spring we mustn't spring you mustn't spring they mustn't spring	I mustn't be springing you mustn't be springing she mustn't be springing we mustn't be springing you mustn't be springing they mustn't be springing
Perfect	V-ing perfect
I mustn't have sprung you mustn't have sprung she mustn't have sprung we mustn't have sprung you mustn't have sprung they mustn't have sprung	I mustn't have been springing you mustn't have been springing she mustn't have been springing we mustn't have been springing you mustn't have been springing they mustn't have been springing

Interrogative form

Simple form	V-ing form
must I spring? must you spring? must she spring? must we spring? must you spring? must they spring?	must I be springing? must you be springing? must she 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 she 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 she 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
mustn't I spring? mustn't you spring? mustn't she spring? mustn't we spring? mustn't you spring? mustn't they spring?	mustn't I be springing? mustn't you be springing? mustn't she be springing? mustn't we be springing? mustn't you be springing? mustn't they be springing?
Perfect	V-ing perfect
mustn't I have sprung? mustn't you have sprung? mustn't she have sprung? mustn't we have sprung? mustn't you have sprung? mustn't they have sprung?	mustn't I have been springing? mustn't you have been springing? mustn't she have been springing? mustn't we have been springing? mustn't you have been springing? mustn't they have been springing?