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