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 mustn't sputter you mustn't sputter she mustn't sputter we mustn't sputter you mustn't sputter they mustn't sputter	I mustn't be sputtering you mustn't be sputtering she mustn't be sputtering we mustn't be sputtering you mustn't be sputtering they mustn't be sputtering
Perfect	V-ing perfect
I mustn't have sputtered you mustn't have sputtered she mustn't have sputtered we mustn't have sputtered you mustn't have sputtered they mustn't have sputtered	I mustn't have been sputtering you mustn't have been sputtering she mustn't have been sputtering we mustn't have been sputtering you mustn't have been sputtering they mustn't 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
mustn't I sputter? mustn't you sputter? mustn't she sputter? mustn't we sputter? mustn't you sputter? mustn't they sputter?	mustn't I be sputtering? mustn't you be sputtering? mustn't she be sputtering? mustn't we be sputtering? mustn't you be sputtering? mustn't they be sputtering?
Perfect	V-ing perfect
mustn't I have sputtered? mustn't you have sputtered? mustn't she have sputtered? mustn't we have sputtered? mustn't you have sputtered? mustn't they have sputtered?	mustn't I have been sputtering? mustn't you have been sputtering? mustn't she have been sputtering? mustn't we have been sputtering? mustn't you have been sputtering? mustn't they have been sputtering?