English verb conjugation
MUST SKITTER

Regular verb: skitter - skittered - skittered

Affirmation

Simple form	V-ing form
I must skitter you must skitter he must skitter we must skitter you must skitter they must skitter	I must be skittering you must be skittering he must be skittering we must be skittering you must be skittering they must be skittering
Perfect	V-ing perfect
I must have skittered you must have skittered he must have skittered we must have skittered you must have skittered they must have skittered	I must have been skittering you must have been skittering he must have been skittering we must have been skittering you must have been skittering they must have been skittering

Negation

Simple form	V-ing form
I must not skitter you must not skitter he must not skitter we must not skitter you must not skitter they must not skitter	I must not be skittering you must not be skittering he must not be skittering we must not be skittering you must not be skittering they must not be skittering
Perfect	V-ing perfect
I must not have skittered you must not have skittered he must not have skittered we must not have skittered you must not have skittered they must not have skittered	I must not have been skittering you must not have been skittering he must not have been skittering we must not have been skittering you must not have been skittering they must not have been skittering

Interrogative form

Simple form	V-ing form
must I skitter? must you skitter? must he skitter? must we skitter? must you skitter? must they skitter?	must I be skittering? must you be skittering? must he be skittering? must we be skittering? must you be skittering? must they be skittering?
Perfect	V-ing perfect
must I have skittered? must you have skittered? must he have skittered? must we have skittered? must you have skittered? must they have skittered?	must I have been skittering? must you have been skittering? must he have been skittering? must we have been skittering? must you have been skittering? must they have been skittering?

Interro-negative form

Simple form	V-ing form
must I not skitter? must you not skitter? must he not skitter? must we not skitter? must you not skitter? must they not skitter?	must I not be skittering? must you not be skittering? must he not be skittering? must we not be skittering? must you not be skittering? must they not be skittering?
Perfect	V-ing perfect
must I not have skittered? must you not have skittered? must he not have skittered? must we not have skittered? must you not have skittered? must they not have skittered?	must I not have been skittering? must you not have been skittering? must he not have been skittering? must we not have been skittering? must you not have been skittering? must they not have been skittering?