I may preface you may preface she may preface we may preface you may preface they may preface
V-ing form
I may be prefacing you may be prefacing she may be prefacing we may be prefacing you may be prefacing they may be prefacing
Perfect
I may have prefaced you may have prefaced she may have prefaced we may have prefaced you may have prefaced they may have prefaced
V-ing perfect
I may have been prefacing you may have been prefacing she may have been prefacing we may have been prefacing you may have been prefacing they may have been prefacing
Negation
Simple form
I may not preface you may not preface she may not preface we may not preface you may not preface they may not preface
V-ing form
I may not be prefacing you may not be prefacing she may not be prefacing we may not be prefacing you may not be prefacing they may not be prefacing
Perfect
I may not have prefaced you may not have prefaced she may not have prefaced we may not have prefaced you may not have prefaced they may not have prefaced
V-ing perfect
I may not have been prefacing you may not have been prefacing she may not have been prefacing we may not have been prefacing you may not have been prefacing they may not have been prefacing
Interrogative form
Simple form
may I preface? may you preface? may she preface? may we preface? may you preface? may they preface?
V-ing form
may I be prefacing? may you be prefacing? may she be prefacing? may we be prefacing? may you be prefacing? may they be prefacing?
Perfect
may I have prefaced? may you have prefaced? may she have prefaced? may we have prefaced? may you have prefaced? may they have prefaced?
V-ing perfect
may I have been prefacing? may you have been prefacing? may she have been prefacing? may we have been prefacing? may you have been prefacing? may they have been prefacing?
Interro-negative form
Simple form
may I not preface? may you not preface? may she not preface? may we not preface? may you not preface? may they not preface?
V-ing form
may I not be prefacing? may you not be prefacing? may she not be prefacing? may we not be prefacing? may you not be prefacing? may they not be prefacing?
Perfect
may I not have prefaced? may you not have prefaced? may she not have prefaced? may we not have prefaced? may you not have prefaced? may they not have prefaced?
V-ing perfect
may I not have been prefacing? may you not have been prefacing? may she not have been prefacing? may we not have been prefacing? may you not have been prefacing? may they not have been prefacing?