must recur
Regular verb: recur - recurred- recurred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must recur
you must recur
he must recur
we must recur
you must recur
they must recur 	I must be recurring
you must be recurring
he must be recurring
we must be recurring
you must be recurring
they must be recurring	I must have recurred
you must have recurred
he must have recurred
we must have recurred
you must have recurred
they must have recurred	I must have been recurring
you must have been recurring
he must have been recurring
we must have been recurring
you must have been recurring
they must have been recurring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't recur
you mustn't recur
he mustn't recur
we mustn't recur
you mustn't recur
they mustn't recur 	I mustn't be recurring
you mustn't be recurring
he mustn't be recurring
we mustn't be recurring
you mustn't be recurring
they mustn't be recurring	I mustn't have recurred
you mustn't have recurred
he mustn't have recurred
we mustn't have recurred
you mustn't have recurred
they mustn't have recurred	I mustn't have been recurring
you mustn't have been recurring
he mustn't have been recurring
we mustn't have been recurring
you mustn't have been recurring
they mustn't have been recurring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I recur?
must you recur?
must he recur?
must we recur?
must you recur?
must they recur? 	must I be recurring?
must you be recurring?
must he be recurring?
must we be recurring?
must you be recurring?
must they be recurring? 	must I have recurred?
must you have recurred?
must he have recurred?
must we have recurred?
must you have recurred?
must they have recurred? 	must I have been recurring?
must you have been recurring?
must he have been recurring?
must we have been recurring?
must you have been recurring?
must they have been recurring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I recur?
mustn't you recur?
mustn't he recur?
mustn't we recur?
mustn't you recur?
mustn't they recur? 	mustn't I be recurring?
mustn't you be recurring?
mustn't he be recurring?
mustn't we be recurring?
mustn't you be recurring?
mustn't they be recurring? 	mustn't I have recurred?
mustn't you have recurred?
mustn't he have recurred?
mustn't we have recurred?
mustn't you have recurred?
mustn't they have recurred? 	mustn't I have been recurring?
mustn't you have been recurring?
mustn't he have been recurring?
mustn't we have been recurring?
mustn't you have been recurring?
mustn't they have been recurring?