must preface
Regular verb: preface - prefaced- prefaced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must preface
you must preface
he must preface
we must preface
you must preface
they must preface 	I must be prefacing
you must be prefacing
he must be prefacing
we must be prefacing
you must be prefacing
they must be prefacing	I must have prefaced
you must have prefaced
he must have prefaced
we must have prefaced
you must have prefaced
they must have prefaced	I must have been prefacing
you must have been prefacing
he must have been prefacing
we must have been prefacing
you must have been prefacing
they must have been prefacing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't preface
you mustn't preface
he mustn't preface
we mustn't preface
you mustn't preface
they mustn't preface 	I mustn't be prefacing
you mustn't be prefacing
he mustn't be prefacing
we mustn't be prefacing
you mustn't be prefacing
they mustn't be prefacing	I mustn't have prefaced
you mustn't have prefaced
he mustn't have prefaced
we mustn't have prefaced
you mustn't have prefaced
they mustn't have prefaced	I mustn't have been prefacing
you mustn't have been prefacing
he mustn't have been prefacing
we mustn't have been prefacing
you mustn't have been prefacing
they mustn't have been prefacing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I preface?
must you preface?
must he preface?
must we preface?
must you preface?
must they preface? 	must I be prefacing?
must you be prefacing?
must he be prefacing?
must we be prefacing?
must you be prefacing?
must they be prefacing? 	must I have prefaced?
must you have prefaced?
must he have prefaced?
must we have prefaced?
must you have prefaced?
must they have prefaced? 	must I have been prefacing?
must you have been prefacing?
must he have been prefacing?
must we have been prefacing?
must you have been prefacing?
must they have been prefacing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I preface?
mustn't you preface?
mustn't he preface?
mustn't we preface?
mustn't you preface?
mustn't they preface? 	mustn't I be prefacing?
mustn't you be prefacing?
mustn't he be prefacing?
mustn't we be prefacing?
mustn't you be prefacing?
mustn't they be prefacing? 	mustn't I have prefaced?
mustn't you have prefaced?
mustn't he have prefaced?
mustn't we have prefaced?
mustn't you have prefaced?
mustn't they have prefaced? 	mustn't I have been prefacing?
mustn't you have been prefacing?
mustn't he have been prefacing?
mustn't we have been prefacing?
mustn't you have been prefacing?
mustn't they have been prefacing?