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