I must button you must button he must button we must button you must button they must button
Forme en V-ing
I must be buttoning you must be buttoning he must be buttoning we must be buttoning you must be buttoning they must be buttoning
Perfect
I must have buttoned you must have buttoned he must have buttoned we must have buttoned you must have buttoned they must have buttoned
Perfect en V-ing
I must have been buttoning you must have been buttoning he must have been buttoning we must have been buttoning you must have been buttoning they must have been buttoning
Négation
Forme simple
I mustn't button you mustn't button he mustn't button we mustn't button you mustn't button they mustn't button
Forme en V-ing
I mustn't be buttoning you mustn't be buttoning he mustn't be buttoning we mustn't be buttoning you mustn't be buttoning they mustn't be buttoning
Perfect
I mustn't have buttoned you mustn't have buttoned he mustn't have buttoned we mustn't have buttoned you mustn't have buttoned they mustn't have buttoned
Perfect en V-ing
I mustn't have been buttoning you mustn't have been buttoning he mustn't have been buttoning we mustn't have been buttoning you mustn't have been buttoning they mustn't have been buttoning
Forme interrogative
Forme simple
must I button? must you button? must he button? must we button? must you button? must they button?
Forme en V-ing
must I be buttoning? must you be buttoning? must he be buttoning? must we be buttoning? must you be buttoning? must they be buttoning?
Perfect
must I have buttoned? must you have buttoned? must he have buttoned? must we have buttoned? must you have buttoned? must they have buttoned?
Perfect en V-ing
must I have been buttoning? must you have been buttoning? must he have been buttoning? must we have been buttoning? must you have been buttoning? must they have been buttoning?
Forme interro-négative
Forme simple
mustn't I button? mustn't you button? mustn't he button? mustn't we button? mustn't you button? mustn't they button?
Forme en V-ing
mustn't I be buttoning? mustn't you be buttoning? mustn't he be buttoning? mustn't we be buttoning? mustn't you be buttoning? mustn't they be buttoning?
Perfect
mustn't I have buttoned? mustn't you have buttoned? mustn't he have buttoned? mustn't we have buttoned? mustn't you have buttoned? mustn't they have buttoned?
Perfect en V-ing
mustn't I have been buttoning? mustn't you have been buttoning? mustn't he have been buttoning? mustn't we have been buttoning? mustn't you have been buttoning? mustn't they have been buttoning?