I must ko you must ko she must ko we must ko you must ko they must ko
Forma con V-ing
I must be koing you must be koing she must be koing we must be koing you must be koing they must be koing
Perfecto
I must have koed you must have koed she must have koed we must have koed you must have koed they must have koed
Perfecto con V-ing
I must have been koing you must have been koing she must have been koing we must have been koing you must have been koing they must have been koing
Negación
Forma simple
I mustn't ko you mustn't ko she mustn't ko we mustn't ko you mustn't ko they mustn't ko
Forma con V-ing
I mustn't be koing you mustn't be koing she mustn't be koing we mustn't be koing you mustn't be koing they mustn't be koing
Perfecto
I mustn't have koed you mustn't have koed she mustn't have koed we mustn't have koed you mustn't have koed they mustn't have koed
Perfecto con V-ing
I mustn't have been koing you mustn't have been koing she mustn't have been koing we mustn't have been koing you mustn't have been koing they mustn't have been koing
Forma interrogativa
Forma simple
must I ko? must you ko? must she ko? must we ko? must you ko? must they ko?
Forma con V-ing
must I be koing? must you be koing? must she be koing? must we be koing? must you be koing? must they be koing?
Perfecto
must I have koed? must you have koed? must she have koed? must we have koed? must you have koed? must they have koed?
Perfecto con V-ing
must I have been koing? must you have been koing? must she have been koing? must we have been koing? must you have been koing? must they have been koing?
Forma interro-negativa
Forma simple
mustn't I ko? mustn't you ko? mustn't she ko? mustn't we ko? mustn't you ko? mustn't they ko?
Forma con V-ing
mustn't I be koing? mustn't you be koing? mustn't she be koing? mustn't we be koing? mustn't you be koing? mustn't they be koing?
Perfecto
mustn't I have koed? mustn't you have koed? mustn't she have koed? mustn't we have koed? mustn't you have koed? mustn't they have koed?
Perfecto con V-ing
mustn't I have been koing? mustn't you have been koing? mustn't she have been koing? mustn't we have been koing? mustn't you have been koing? mustn't they have been koing?