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 must not shutter you must not shutter he must not shutter we must not shutter you must not shutter they must not shutter	I must not be shuttering you must not be shuttering he must not be shuttering we must not be shuttering you must not be shuttering they must not be shuttering
Perfect	V-ing perfect
I must not have shuttered you must not have shuttered he must not have shuttered we must not have shuttered you must not have shuttered they must not have shuttered	I must not have been shuttering you must not have been shuttering he must not have been shuttering we must not have been shuttering you must not have been shuttering they must not 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
must I not shutter? must you not shutter? must he not shutter? must we not shutter? must you not shutter? must they not shutter?	must I not be shuttering? must you not be shuttering? must he not be shuttering? must we not be shuttering? must you not be shuttering? must they not be shuttering?
Perfect	V-ing perfect
must I not have shuttered? must you not have shuttered? must he not have shuttered? must we not have shuttered? must you not have shuttered? must they not have shuttered?	must I not have been shuttering? must you not have been shuttering? must he not have been shuttering? must we not have been shuttering? must you not have been shuttering? must they not have been shuttering?