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 cannot fester you cannot fester he cannot fester we cannot fester you cannot fester they cannot fester
Forma con V-ing
I cannot be festering you cannot be festering he cannot be festering we cannot be festering you cannot be festering they cannot be festering
Perfecto
I cannot have festered you cannot have festered he cannot have festered we cannot have festered you cannot have festered they cannot have festered
Perfecto con V-ing
I cannot have been festering you cannot have been festering he cannot have been festering we cannot have been festering you cannot have been festering they cannot 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 I not fester? can you not fester? can he not fester? can we not fester? can you not fester? can they not fester?
Forma con V-ing
can I not be festering? can you not be festering? can he not be festering? can we not be festering? can you not be festering? can they not be festering?
Perfecto
can I not have festered? can you not have festered? can he not have festered? can we not have festered? can you not have festered? can they not have festered?
Perfecto con V-ing
can I not have been festering? can you not have been festering? can he not have been festering? can we not have been festering? can you not have been festering? can they not have been festering?