must frequent
Regular verb: frequent - frequented- frequented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must frequent
you must frequent
she must frequent
we must frequent
you must frequent
they must frequent 	I must be frequenting
you must be frequenting
she must be frequenting
we must be frequenting
you must be frequenting
they must be frequenting	I must have frequented
you must have frequented
she must have frequented
we must have frequented
you must have frequented
they must have frequented	I must have been frequenting
you must have been frequenting
she must have been frequenting
we must have been frequenting
you must have been frequenting
they must have been frequenting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't frequent
you mustn't frequent
she mustn't frequent
we mustn't frequent
you mustn't frequent
they mustn't frequent 	I mustn't be frequenting
you mustn't be frequenting
she mustn't be frequenting
we mustn't be frequenting
you mustn't be frequenting
they mustn't be frequenting	I mustn't have frequented
you mustn't have frequented
she mustn't have frequented
we mustn't have frequented
you mustn't have frequented
they mustn't have frequented	I mustn't have been frequenting
you mustn't have been frequenting
she mustn't have been frequenting
we mustn't have been frequenting
you mustn't have been frequenting
they mustn't have been frequenting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I frequent?
must you frequent?
must she frequent?
must we frequent?
must you frequent?
must they frequent? 	must I be frequenting?
must you be frequenting?
must she be frequenting?
must we be frequenting?
must you be frequenting?
must they be frequenting? 	must I have frequented?
must you have frequented?
must she have frequented?
must we have frequented?
must you have frequented?
must they have frequented? 	must I have been frequenting?
must you have been frequenting?
must she have been frequenting?
must we have been frequenting?
must you have been frequenting?
must they have been frequenting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I frequent?
mustn't you frequent?
mustn't she frequent?
mustn't we frequent?
mustn't you frequent?
mustn't they frequent? 	mustn't I be frequenting?
mustn't you be frequenting?
mustn't she be frequenting?
mustn't we be frequenting?
mustn't you be frequenting?
mustn't they be frequenting? 	mustn't I have frequented?
mustn't you have frequented?
mustn't she have frequented?
mustn't we have frequented?
mustn't you have frequented?
mustn't they have frequented? 	mustn't I have been frequenting?
mustn't you have been frequenting?
mustn't she have been frequenting?
mustn't we have been frequenting?
mustn't you have been frequenting?
mustn't they have been frequenting?