English verb conjugation
MUST SPUTTER

Regular verb: sputter - sputtered - sputtered

Affirmation

Simple form	V-ing form
I must sputter you must sputter she must sputter we must sputter you must sputter they must sputter	I must be sputtering you must be sputtering she must be sputtering we must be sputtering you must be sputtering they must be sputtering
Perfect	V-ing perfect
I must have sputtered you must have sputtered she must have sputtered we must have sputtered you must have sputtered they must have sputtered	I must have been sputtering you must have been sputtering she must have been sputtering we must have been sputtering you must have been sputtering they must have been sputtering

Negation

Simple form	V-ing form
I must not sputter you must not sputter she must not sputter we must not sputter you must not sputter they must not sputter	I must not be sputtering you must not be sputtering she must not be sputtering we must not be sputtering you must not be sputtering they must not be sputtering
Perfect	V-ing perfect
I must not have sputtered you must not have sputtered she must not have sputtered we must not have sputtered you must not have sputtered they must not have sputtered	I must not have been sputtering you must not have been sputtering she must not have been sputtering we must not have been sputtering you must not have been sputtering they must not have been sputtering

Interrogative form

Simple form	V-ing form
must I sputter? must you sputter? must she sputter? must we sputter? must you sputter? must they sputter?	must I be sputtering? must you be sputtering? must she be sputtering? must we be sputtering? must you be sputtering? must they be sputtering?
Perfect	V-ing perfect
must I have sputtered? must you have sputtered? must she have sputtered? must we have sputtered? must you have sputtered? must they have sputtered?	must I have been sputtering? must you have been sputtering? must she have been sputtering? must we have been sputtering? must you have been sputtering? must they have been sputtering?

Interro-negative form

Simple form	V-ing form
must I not sputter? must you not sputter? must she not sputter? must we not sputter? must you not sputter? must they not sputter?	must I not be sputtering? must you not be sputtering? must she not be sputtering? must we not be sputtering? must you not be sputtering? must they not be sputtering?
Perfect	V-ing perfect
must I not have sputtered? must you not have sputtered? must she not have sputtered? must we not have sputtered? must you not have sputtered? must they not have sputtered?	must I not have been sputtering? must you not have been sputtering? must she not have been sputtering? must we not have been sputtering? must you not have been sputtering? must they not have been sputtering?