English verb conjugation
CAN PREFACE

Regular verb: preface - prefaced - prefaced

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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