Irregular verb: spell - spelled, spelt - spelled, spelt
Affirmation
Simple form
I must spell you must spell she must spell we must spell you must spell they must spell
V-ing form
I must be spelling you must be spelling she must be spelling we must be spelling you must be spelling they must be spelling
Perfect
I must have spelled, spelt you must have spelled, spelt she must have spelled, spelt we must have spelled, spelt you must have spelled, spelt they must have spelled, spelt
V-ing perfect
I must have been spelling you must have been spelling she must have been spelling we must have been spelling you must have been spelling they must have been spelling
Negation
Simple form
I mustn't spell you mustn't spell she mustn't spell we mustn't spell you mustn't spell they mustn't spell
V-ing form
I mustn't be spelling you mustn't be spelling she mustn't be spelling we mustn't be spelling you mustn't be spelling they mustn't be spelling
Perfect
I mustn't have spelled, spelt you mustn't have spelled, spelt she mustn't have spelled, spelt we mustn't have spelled, spelt you mustn't have spelled, spelt they mustn't have spelled, spelt
V-ing perfect
I mustn't have been spelling you mustn't have been spelling she mustn't have been spelling we mustn't have been spelling you mustn't have been spelling they mustn't have been spelling
Interrogative form
Simple form
must I spell? must you spell? must she spell? must we spell? must you spell? must they spell?
V-ing form
must I be spelling? must you be spelling? must she be spelling? must we be spelling? must you be spelling? must they be spelling?
Perfect
must I have spelled, spelt? must you have spelled, spelt? must she have spelled, spelt? must we have spelled, spelt? must you have spelled, spelt? must they have spelled, spelt?
V-ing perfect
must I have been spelling? must you have been spelling? must she have been spelling? must we have been spelling? must you have been spelling? must they have been spelling?
Interro-negative form
Simple form
mustn't I spell? mustn't you spell? mustn't she spell? mustn't we spell? mustn't you spell? mustn't they spell?
V-ing form
mustn't I be spelling? mustn't you be spelling? mustn't she be spelling? mustn't we be spelling? mustn't you be spelling? mustn't they be spelling?
Perfect
mustn't I have spelled, spelt? mustn't you have spelled, spelt? mustn't she have spelled, spelt? mustn't we have spelled, spelt? mustn't you have spelled, spelt? mustn't they have spelled, spelt?
V-ing perfect
mustn't I have been spelling? mustn't you have been spelling? mustn't she have been spelling? mustn't we have been spelling? mustn't you have been spelling? mustn't they have been spelling?