English verb conjugation
MUST REOCCUR

Regular verb: reoccur - reoccured - reoccured

Affirmation

Simple form	V-ing form
I must reoccur you must reoccur he must reoccur we must reoccur you must reoccur they must reoccur	I must be reoccuring you must be reoccuring he must be reoccuring we must be reoccuring you must be reoccuring they must be reoccuring
Perfect	V-ing perfect
I must have reoccured you must have reoccured he must have reoccured we must have reoccured you must have reoccured they must have reoccured	I must have been reoccuring you must have been reoccuring he must have been reoccuring we must have been reoccuring you must have been reoccuring they must have been reoccuring

Negation

Simple form	V-ing form
I must not reoccur you must not reoccur he must not reoccur we must not reoccur you must not reoccur they must not reoccur	I must not be reoccuring you must not be reoccuring he must not be reoccuring we must not be reoccuring you must not be reoccuring they must not be reoccuring
Perfect	V-ing perfect
I must not have reoccured you must not have reoccured he must not have reoccured we must not have reoccured you must not have reoccured they must not have reoccured	I must not have been reoccuring you must not have been reoccuring he must not have been reoccuring we must not have been reoccuring you must not have been reoccuring they must not have been reoccuring

Interrogative form

Simple form	V-ing form
must I reoccur? must you reoccur? must he reoccur? must we reoccur? must you reoccur? must they reoccur?	must I be reoccuring? must you be reoccuring? must he be reoccuring? must we be reoccuring? must you be reoccuring? must they be reoccuring?
Perfect	V-ing perfect
must I have reoccured? must you have reoccured? must he have reoccured? must we have reoccured? must you have reoccured? must they have reoccured?	must I have been reoccuring? must you have been reoccuring? must he have been reoccuring? must we have been reoccuring? must you have been reoccuring? must they have been reoccuring?

Interro-negative form

Simple form	V-ing form
must I not reoccur? must you not reoccur? must he not reoccur? must we not reoccur? must you not reoccur? must they not reoccur?	must I not be reoccuring? must you not be reoccuring? must he not be reoccuring? must we not be reoccuring? must you not be reoccuring? must they not be reoccuring?
Perfect	V-ing perfect
must I not have reoccured? must you not have reoccured? must he not have reoccured? must we not have reoccured? must you not have reoccured? must they not have reoccured?	must I not have been reoccuring? must you not have been reoccuring? must he not have been reoccuring? must we not have been reoccuring? must you not have been reoccuring? must they not have been reoccuring?