could preface
Verbo regular: preface - prefaced- prefaced

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?