English verb conjugation
MUST SPELL

Irregular verb: spell - spelled, spelt - spelled, spelt

Affirmation

Simple form	V-ing form
I must spell you must spell he must spell we must spell you must spell they must spell	I must be spelling you must be spelling he must be spelling we must be spelling you must be spelling they must be spelling
Perfect	V-ing perfect
I must have spelled, spelt you must have spelled, spelt he must have spelled, spelt we must have spelled, spelt you must have spelled, spelt they must have spelled, spelt	I must have been spelling you must have been spelling he must have been spelling we must have been spelling you must have been spelling they must have been spelling

Negation

Simple form	V-ing form
I must not spell you must not spell he must not spell we must not spell you must not spell they must not spell	I must not be spelling you must not be spelling he must not be spelling we must not be spelling you must not be spelling they must not be spelling
Perfect	V-ing perfect
I must not have spelled, spelt you must not have spelled, spelt he must not have spelled, spelt we must not have spelled, spelt you must not have spelled, spelt they must not have spelled, spelt	I must not have been spelling you must not have been spelling he must not have been spelling we must not have been spelling you must not have been spelling they must not have been spelling

Interrogative form

Simple form	V-ing form
must I spell? must you spell? must he spell? must we spell? must you spell? must they spell?	must I be spelling? must you be spelling? must he be spelling? must we be spelling? must you be spelling? must they be spelling?
Perfect	V-ing perfect
must I have spelled, spelt? must you have spelled, spelt? must he have spelled, spelt? must we have spelled, spelt? must you have spelled, spelt? must they have spelled, spelt?	must I have been spelling? must you have been spelling? must he have been spelling? must we have been spelling? must you have been spelling? must they have been spelling?

Interro-negative form

Simple form	V-ing form
must I not spell? must you not spell? must he not spell? must we not spell? must you not spell? must they not spell?	must I not be spelling? must you not be spelling? must he not be spelling? must we not be spelling? must you not be spelling? must they not be spelling?
Perfect	V-ing perfect
must I not have spelled, spelt? must you not have spelled, spelt? must he not have spelled, spelt? must we not have spelled, spelt? must you not have spelled, spelt? must they not have spelled, spelt?	must I not have been spelling? must you not have been spelling? must he not have been spelling? must we not have been spelling? must you not have been spelling? must they not have been spelling?