I must goof you must goof she must goof we must goof you must goof they must goof
Forma con V-ing
I must be goofing you must be goofing she must be goofing we must be goofing you must be goofing they must be goofing
Perfecto
I must have goofed you must have goofed she 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 she 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 she 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 she 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 she 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 she 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 she goof? must we goof? must you goof? must they goof?
Forma con V-ing
must I be goofing? must you be goofing? must she be goofing? must we be goofing? must you be goofing? must they be goofing?
Perfecto
must I have goofed? must you have goofed? must she 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 she 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 she 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 she 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 she 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 she have been goofing? mustn't we have been goofing? mustn't you have been goofing? mustn't they have been goofing?