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