I must assure you must assure he must assure we must assure you must assure they must assure
V-ing form
I must be assuring you must be assuring he must be assuring we must be assuring you must be assuring they must be assuring
Perfect
I must have assured you must have assured he 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 he must have been assuring we must have been assuring you must have been assuring they must have been assuring
Negation
Simple form
I must not assure you must not assure he must not assure we must not assure you must not assure they must not assure
V-ing form
I must not be assuring you must not be assuring he must not be assuring we must not be assuring you must not be assuring they must not be assuring
Perfect
I must not have assured you must not have assured he must not have assured we must not have assured you must not have assured they must not have assured
V-ing perfect
I must not have been assuring you must not have been assuring he must not have been assuring we must not have been assuring you must not have been assuring they must not have been assuring
Interrogative form
Simple form
must I assure? must you assure? must he assure? must we assure? must you assure? must they assure?
V-ing form
must I be assuring? must you be assuring? must he be assuring? must we be assuring? must you be assuring? must they be assuring?
Perfect
must I have assured? must you have assured? must he 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 he have been assuring? must we have been assuring? must you have been assuring? must they have been assuring?
Interro-negative form
Simple form
must I not assure? must you not assure? must he not assure? must we not assure? must you not assure? must they not assure?
V-ing form
must I not be assuring? must you not be assuring? must he not be assuring? must we not be assuring? must you not be assuring? must they not be assuring?
Perfect
must I not have assured? must you not have assured? must he not have assured? must we not have assured? must you not have assured? must they not have assured?
V-ing perfect
must I not have been assuring? must you not have been assuring? must he not have been assuring? must we not have been assuring? must you not have been assuring? must they not have been assuring?