must reoccur
Regular verb: reoccur - reoccured- reoccured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?