must preface
Verbo regular: preface - prefaced- prefaced

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must preface
you must preface
he must preface
we must preface
you must preface
they must preface 	I must be prefacing
you must be prefacing
he must be prefacing
we must be prefacing
you must be prefacing
they must be prefacing	I must have prefaced
you must have prefaced
he must have prefaced
we must have prefaced
you must have prefaced
they must have prefaced	I must have been prefacing
you must have been prefacing
he must have been prefacing
we must have been prefacing
you must have been prefacing
they must have been prefacing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not preface
you must not preface
he must not preface
we must not preface
you must not preface
they must not preface 	I must not be prefacing
you must not be prefacing
he must not be prefacing
we must not be prefacing
you must not be prefacing
they must not be prefacing	I must not have prefaced
you must not have prefaced
he must not have prefaced
we must not have prefaced
you must not have prefaced
they must not have prefaced	I must not have been prefacing
you must not have been prefacing
he must not have been prefacing
we must not have been prefacing
you must not have been prefacing
they must not have been prefacing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I preface?
must you preface?
must he preface?
must we preface?
must you preface?
must they preface? 	must I be prefacing?
must you be prefacing?
must he be prefacing?
must we be prefacing?
must you be prefacing?
must they be prefacing? 	must I have prefaced?
must you have prefaced?
must he have prefaced?
must we have prefaced?
must you have prefaced?
must they have prefaced? 	must I have been prefacing?
must you have been prefacing?
must he have been prefacing?
must we have been prefacing?
must you have been prefacing?
must they have been prefacing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not preface?
must you not preface?
must he not preface?
must we not preface?
must you not preface?
must they not preface? 	must I not be prefacing?
must you not be prefacing?
must he not be prefacing?
must we not be prefacing?
must you not be prefacing?
must they not be prefacing? 	must I not have prefaced?
must you not have prefaced?
must he not have prefaced?
must we not have prefaced?
must you not have prefaced?
must they not have prefaced? 	must I not have been prefacing?
must you not have been prefacing?
must he not have been prefacing?
must we not have been prefacing?
must you not have been prefacing?
must they not have been prefacing?