I can preface you can preface he can preface we can preface you can preface they can preface
V-ing form
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
I can have prefaced you can have prefaced he can have prefaced we can have prefaced you can have prefaced they can have prefaced
V-ing perfect
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
I can't preface you can't preface he can't preface we can't preface you can't preface they can't preface
V-ing form
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
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
V-ing perfect
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
can I preface? can you preface? can he preface? can we preface? can you preface? can they preface?
V-ing form
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
can I have prefaced? can you have prefaced? can he have prefaced? can we have prefaced? can you have prefaced? can they have prefaced?
V-ing perfect
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
can't I preface? can't you preface? can't he preface? can't we preface? can't you preface? can't they preface?
V-ing form
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
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?
V-ing perfect
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?