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