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