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