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 mustn't reoccur you mustn't reoccur he mustn't reoccur we mustn't reoccur you mustn't reoccur they mustn't reoccur	I mustn't be reoccuring you mustn't be reoccuring he mustn't be reoccuring we mustn't be reoccuring you mustn't be reoccuring they mustn't be reoccuring
Perfect	V-ing perfect
I mustn't have reoccured you mustn't have reoccured he mustn't have reoccured we mustn't have reoccured you mustn't have reoccured they mustn't have reoccured	I mustn't have been reoccuring you mustn't have been reoccuring he mustn't have been reoccuring we mustn't have been reoccuring you mustn't have been reoccuring they mustn't 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
mustn't I reoccur? mustn't you reoccur? mustn't he reoccur? mustn't we reoccur? mustn't you reoccur? mustn't they reoccur?	mustn't I be reoccuring? mustn't you be reoccuring? mustn't he be reoccuring? mustn't we be reoccuring? mustn't you be reoccuring? mustn't they be reoccuring?
Perfect	V-ing perfect
mustn't I have reoccured? mustn't you have reoccured? mustn't he have reoccured? mustn't we have reoccured? mustn't you have reoccured? mustn't they have reoccured?	mustn't I have been reoccuring? mustn't you have been reoccuring? mustn't he have been reoccuring? mustn't we have been reoccuring? mustn't you have been reoccuring? mustn't they have been reoccuring?