I must goof you must goof he must goof we must goof you must goof they must goof
Forma con V-ing
I must be goofing you must be goofing he must be goofing we must be goofing you must be goofing they must be goofing
Perfecto
I must have goofed you must have goofed he must have goofed we must have goofed you must have goofed they must have goofed
Perfecto con V-ing
I must have been goofing you must have been goofing he must have been goofing we must have been goofing you must have been goofing they must have been goofing
Negación
Forma simple
I mustn't goof you mustn't goof he mustn't goof we mustn't goof you mustn't goof they mustn't goof
Forma con V-ing
I mustn't be goofing you mustn't be goofing he mustn't be goofing we mustn't be goofing you mustn't be goofing they mustn't be goofing
Perfecto
I mustn't have goofed you mustn't have goofed he mustn't have goofed we mustn't have goofed you mustn't have goofed they mustn't have goofed
Perfecto con V-ing
I mustn't have been goofing you mustn't have been goofing he mustn't have been goofing we mustn't have been goofing you mustn't have been goofing they mustn't have been goofing
Forma interrogativa
Forma simple
must I goof? must you goof? must he goof? must we goof? must you goof? must they goof?
Forma con V-ing
must I be goofing? must you be goofing? must he be goofing? must we be goofing? must you be goofing? must they be goofing?
Perfecto
must I have goofed? must you have goofed? must he have goofed? must we have goofed? must you have goofed? must they have goofed?
Perfecto con V-ing
must I have been goofing? must you have been goofing? must he have been goofing? must we have been goofing? must you have been goofing? must they have been goofing?
Forma interro-negativa
Forma simple
mustn't I goof? mustn't you goof? mustn't he goof? mustn't we goof? mustn't you goof? mustn't they goof?
Forma con V-ing
mustn't I be goofing? mustn't you be goofing? mustn't he be goofing? mustn't we be goofing? mustn't you be goofing? mustn't they be goofing?
Perfecto
mustn't I have goofed? mustn't you have goofed? mustn't he have goofed? mustn't we have goofed? mustn't you have goofed? mustn't they have goofed?
Perfecto con V-ing
mustn't I have been goofing? mustn't you have been goofing? mustn't he have been goofing? mustn't we have been goofing? mustn't you have been goofing? mustn't they have been goofing?