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 must not frequent
you must not frequent
she must not frequent
we must not frequent
you must not frequent
they must not frequent 	I must not be frequenting
you must not be frequenting
she must not be frequenting
we must not be frequenting
you must not be frequenting
they must not be frequenting	I must not have frequented
you must not have frequented
she must not have frequented
we must not have frequented
you must not have frequented
they must not have frequented	I must not have been frequenting
you must not have been frequenting
she must not have been frequenting
we must not have been frequenting
you must not have been frequenting
they must not 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 	
must I not frequent?
must you not frequent?
must she not frequent?
must we not frequent?
must you not frequent?
must they not frequent? 	must I not be frequenting?
must you not be frequenting?
must she not be frequenting?
must we not be frequenting?
must you not be frequenting?
must they not be frequenting? 	must I not have frequented?
must you not have frequented?
must she not have frequented?
must we not have frequented?
must you not have frequented?
must they not have frequented? 	must I not have been frequenting?
must you not have been frequenting?
must she not have been frequenting?
must we not have been frequenting?
must you not have been frequenting?
must they not have been frequenting?