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