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