I can fester you can fester he can fester we can fester you can fester they can fester
Forma con V-ing
I can be festering you can be festering he can be festering we can be festering you can be festering they can be festering
Perfecto
I can have festered you can have festered he can have festered we can have festered you can have festered they can have festered
Perfecto con V-ing
I can have been festering you can have been festering he can have been festering we can have been festering you can have been festering they can have been festering
Negación
Forma simple
I can't fester you can't fester he can't fester we can't fester you can't fester they can't fester
Forma con V-ing
I can't be festering you can't be festering he can't be festering we can't be festering you can't be festering they can't be festering
Perfecto
I can't have festered you can't have festered he can't have festered we can't have festered you can't have festered they can't have festered
Perfecto con V-ing
I can't have been festering you can't have been festering he can't have been festering we can't have been festering you can't have been festering they can't have been festering
Forma interrogativa
Forma simple
can I fester? can you fester? can he fester? can we fester? can you fester? can they fester?
Forma con V-ing
can I be festering? can you be festering? can he be festering? can we be festering? can you be festering? can they be festering?
Perfecto
can I have festered? can you have festered? can he have festered? can we have festered? can you have festered? can they have festered?
Perfecto con V-ing
can I have been festering? can you have been festering? can he have been festering? can we have been festering? can you have been festering? can they have been festering?
Forma interro-negativa
Forma simple
can't I fester? can't you fester? can't he fester? can't we fester? can't you fester? can't they fester?
Forma con V-ing
can't I be festering? can't you be festering? can't he be festering? can't we be festering? can't you be festering? can't they be festering?
Perfecto
can't I have festered? can't you have festered? can't he have festered? can't we have festered? can't you have festered? can't they have festered?
Perfecto con V-ing
can't I have been festering? can't you have been festering? can't he have been festering? can't we have been festering? can't you have been festering? can't they have been festering?