English verb conjugation
COULD PREFACE

Regular verb: preface - prefaced - prefaced

Affirmation

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

Negation

Simple form	V-ing form
I could not preface you could not preface he could not preface we could not preface you could not preface they could not preface	I could not be prefacing you could not be prefacing he could not be prefacing we could not be prefacing you could not be prefacing they could not be prefacing
Perfect	V-ing perfect
I could not have prefaced you could not have prefaced he could not have prefaced we could not have prefaced you could not have prefaced they could not have prefaced	I could not have been prefacing you could not have been prefacing he could not have been prefacing we could not have been prefacing you could not have been prefacing they could not have been prefacing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
could I not preface? could you not preface? could he not preface? could we not preface? could you not preface? could they not preface?	could I not be prefacing? could you not be prefacing? could he not be prefacing? could we not be prefacing? could you not be prefacing? could they not be prefacing?
Perfect	V-ing perfect
could I not have prefaced? could you not have prefaced? could he not have prefaced? could we not have prefaced? could you not have prefaced? could they not have prefaced?	could I not have been prefacing? could you not have been prefacing? could he not have been prefacing? could we not have been prefacing? could you not have been prefacing? could they not have been prefacing?