English verb conjugation
MUST PREFACE

Regular verb: preface - prefaced - prefaced

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?