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 couldn't preface you couldn't preface he couldn't preface we couldn't preface you couldn't preface they couldn't preface	I couldn't be prefacing you couldn't be prefacing he couldn't be prefacing we couldn't be prefacing you couldn't be prefacing they couldn't be prefacing
Perfect	V-ing perfect
I couldn't have prefaced you couldn't have prefaced he couldn't have prefaced we couldn't have prefaced you couldn't have prefaced they couldn't have prefaced	I couldn't have been prefacing you couldn't have been prefacing he couldn't have been prefacing we couldn't have been prefacing you couldn't have been prefacing they couldn't 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
couldn't I preface? couldn't you preface? couldn't he preface? couldn't we preface? couldn't you preface? couldn't they preface?	couldn't I be prefacing? couldn't you be prefacing? couldn't he be prefacing? couldn't we be prefacing? couldn't you be prefacing? couldn't they be prefacing?
Perfect	V-ing perfect
couldn't I have prefaced? couldn't you have prefaced? couldn't he have prefaced? couldn't we have prefaced? couldn't you have prefaced? couldn't they have prefaced?	couldn't I have been prefacing? couldn't you have been prefacing? couldn't he have been prefacing? couldn't we have been prefacing? couldn't you have been prefacing? couldn't they have been prefacing?