I must assure you must assure she must assure we must assure you must assure they must assure
V-ing form
I must be assuring you must be assuring she must be assuring we must be assuring you must be assuring they must be assuring
Perfect
I must have assured you must have assured she must have assured we must have assured you must have assured they must have assured
V-ing perfect
I must have been assuring you must have been assuring she must have been assuring we must have been assuring you must have been assuring they must have been assuring
Negation
Simple form
I mustn't assure you mustn't assure she mustn't assure we mustn't assure you mustn't assure they mustn't assure
V-ing form
I mustn't be assuring you mustn't be assuring she mustn't be assuring we mustn't be assuring you mustn't be assuring they mustn't be assuring
Perfect
I mustn't have assured you mustn't have assured she mustn't have assured we mustn't have assured you mustn't have assured they mustn't have assured
V-ing perfect
I mustn't have been assuring you mustn't have been assuring she mustn't have been assuring we mustn't have been assuring you mustn't have been assuring they mustn't have been assuring
Interrogative form
Simple form
must I assure? must you assure? must she assure? must we assure? must you assure? must they assure?
V-ing form
must I be assuring? must you be assuring? must she be assuring? must we be assuring? must you be assuring? must they be assuring?
Perfect
must I have assured? must you have assured? must she have assured? must we have assured? must you have assured? must they have assured?
V-ing perfect
must I have been assuring? must you have been assuring? must she have been assuring? must we have been assuring? must you have been assuring? must they have been assuring?
Interro-negative form
Simple form
mustn't I assure? mustn't you assure? mustn't she assure? mustn't we assure? mustn't you assure? mustn't they assure?
V-ing form
mustn't I be assuring? mustn't you be assuring? mustn't she be assuring? mustn't we be assuring? mustn't you be assuring? mustn't they be assuring?
Perfect
mustn't I have assured? mustn't you have assured? mustn't she have assured? mustn't we have assured? mustn't you have assured? mustn't they have assured?
V-ing perfect
mustn't I have been assuring? mustn't you have been assuring? mustn't she have been assuring? mustn't we have been assuring? mustn't you have been assuring? mustn't they have been assuring?