Cuidado, este verbo pode não existir, a conjugação é dada como exemplo.
Afirmação
Forma simple
I must prefacer you must prefacer he must prefacer we must prefacer you must prefacer they must prefacer
Forma com V-ing
I must be prefacering you must be prefacering he must be prefacering we must be prefacering you must be prefacering they must be prefacering
Perfeito
I must have prefacered you must have prefacered he must have prefacered we must have prefacered you must have prefacered they must have prefacered
Perfeito com V-ing
I must have been prefacering you must have been prefacering he must have been prefacering we must have been prefacering you must have been prefacering they must have been prefacering
Negação
Forma simple
I must not prefacer you must not prefacer he must not prefacer we must not prefacer you must not prefacer they must not prefacer
Forma com V-ing
I must not be prefacering you must not be prefacering he must not be prefacering we must not be prefacering you must not be prefacering they must not be prefacering
Perfeito
I must not have prefacered you must not have prefacered he must not have prefacered we must not have prefacered you must not have prefacered they must not have prefacered
Perfeito com V-ing
I must not have been prefacering you must not have been prefacering he must not have been prefacering we must not have been prefacering you must not have been prefacering they must not have been prefacering
Forma interrogativa
Forma simple
must I prefacer? must you prefacer? must he prefacer? must we prefacer? must you prefacer? must they prefacer?
Forma com V-ing
must I be prefacering? must you be prefacering? must he be prefacering? must we be prefacering? must you be prefacering? must they be prefacering?
Perfeito
must I have prefacered? must you have prefacered? must he have prefacered? must we have prefacered? must you have prefacered? must they have prefacered?
Perfeito com V-ing
must I have been prefacering? must you have been prefacering? must he have been prefacering? must we have been prefacering? must you have been prefacering? must they have been prefacering?
Forma interro-Negação
Forma simple
must I not prefacer? must you not prefacer? must he not prefacer? must we not prefacer? must you not prefacer? must they not prefacer?
Forma com V-ing
must I not be prefacering? must you not be prefacering? must he not be prefacering? must we not be prefacering? must you not be prefacering? must they not be prefacering?
Perfeito
must I not have prefacered? must you not have prefacered? must he not have prefacered? must we not have prefacered? must you not have prefacered? must they not have prefacered?
Perfeito com V-ing
must I not have been prefacering? must you not have been prefacering? must he not have been prefacering? must we not have been prefacering? must you not have been prefacering? must they not have been prefacering?