English verb conjugation
MUST SHUTTER

Regular verb: shutter - shuttered - shuttered

Affirmation

Simple form	V-ing form
I must shutter you must shutter he must shutter we must shutter you must shutter they must shutter	I must be shuttering you must be shuttering he must be shuttering we must be shuttering you must be shuttering they must be shuttering
Perfect	V-ing perfect
I must have shuttered you must have shuttered he must have shuttered we must have shuttered you must have shuttered they must have shuttered	I must have been shuttering you must have been shuttering he must have been shuttering we must have been shuttering you must have been shuttering they must have been shuttering

Negation

Simple form	V-ing form
I mustn't shutter you mustn't shutter he mustn't shutter we mustn't shutter you mustn't shutter they mustn't shutter	I mustn't be shuttering you mustn't be shuttering he mustn't be shuttering we mustn't be shuttering you mustn't be shuttering they mustn't be shuttering
Perfect	V-ing perfect
I mustn't have shuttered you mustn't have shuttered he mustn't have shuttered we mustn't have shuttered you mustn't have shuttered they mustn't have shuttered	I mustn't have been shuttering you mustn't have been shuttering he mustn't have been shuttering we mustn't have been shuttering you mustn't have been shuttering they mustn't have been shuttering

Interrogative form

Simple form	V-ing form
must I shutter? must you shutter? must he shutter? must we shutter? must you shutter? must they shutter?	must I be shuttering? must you be shuttering? must he be shuttering? must we be shuttering? must you be shuttering? must they be shuttering?
Perfect	V-ing perfect
must I have shuttered? must you have shuttered? must he have shuttered? must we have shuttered? must you have shuttered? must they have shuttered?	must I have been shuttering? must you have been shuttering? must he have been shuttering? must we have been shuttering? must you have been shuttering? must they have been shuttering?

Interro-negative form

Simple form	V-ing form
mustn't I shutter? mustn't you shutter? mustn't he shutter? mustn't we shutter? mustn't you shutter? mustn't they shutter?	mustn't I be shuttering? mustn't you be shuttering? mustn't he be shuttering? mustn't we be shuttering? mustn't you be shuttering? mustn't they be shuttering?
Perfect	V-ing perfect
mustn't I have shuttered? mustn't you have shuttered? mustn't he have shuttered? mustn't we have shuttered? mustn't you have shuttered? mustn't they have shuttered?	mustn't I have been shuttering? mustn't you have been shuttering? mustn't he have been shuttering? mustn't we have been shuttering? mustn't you have been shuttering? mustn't they have been shuttering?