must frill
Regular verb: frill - frilled- frilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must frill
you must frill
he must frill
we must frill
you must frill
they must frill 	I must be frilling
you must be frilling
he must be frilling
we must be frilling
you must be frilling
they must be frilling	I must have frilled
you must have frilled
he must have frilled
we must have frilled
you must have frilled
they must have frilled	I must have been frilling
you must have been frilling
he must have been frilling
we must have been frilling
you must have been frilling
they must have been frilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not frill
you must not frill
he must not frill
we must not frill
you must not frill
they must not frill 	I must not be frilling
you must not be frilling
he must not be frilling
we must not be frilling
you must not be frilling
they must not be frilling	I must not have frilled
you must not have frilled
he must not have frilled
we must not have frilled
you must not have frilled
they must not have frilled	I must not have been frilling
you must not have been frilling
he must not have been frilling
we must not have been frilling
you must not have been frilling
they must not have been frilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I frill?
must you frill?
must he frill?
must we frill?
must you frill?
must they frill? 	must I be frilling?
must you be frilling?
must he be frilling?
must we be frilling?
must you be frilling?
must they be frilling? 	must I have frilled?
must you have frilled?
must he have frilled?
must we have frilled?
must you have frilled?
must they have frilled? 	must I have been frilling?
must you have been frilling?
must he have been frilling?
must we have been frilling?
must you have been frilling?
must they have been frilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not frill?
must you not frill?
must he not frill?
must we not frill?
must you not frill?
must they not frill? 	must I not be frilling?
must you not be frilling?
must he not be frilling?
must we not be frilling?
must you not be frilling?
must they not be frilling? 	must I not have frilled?
must you not have frilled?
must he not have frilled?
must we not have frilled?
must you not have frilled?
must they not have frilled? 	must I not have been frilling?
must you not have been frilling?
must he not have been frilling?
must we not have been frilling?
must you not have been frilling?
must they not have been frilling?