I could fever you could fever he could fever we could fever you could fever they could fever
Forma con V-ing
I could be fevering you could be fevering he could be fevering we could be fevering you could be fevering they could be fevering
Perfecto
I could have fevered you could have fevered he could have fevered we could have fevered you could have fevered they could have fevered
Perfecto con V-ing
I could have been fevering you could have been fevering he could have been fevering we could have been fevering you could have been fevering they could have been fevering
Negación
Forma simple
I could not fever you could not fever he could not fever we could not fever you could not fever they could not fever
Forma con V-ing
I could not be fevering you could not be fevering he could not be fevering we could not be fevering you could not be fevering they could not be fevering
Perfecto
I could not have fevered you could not have fevered he could not have fevered we could not have fevered you could not have fevered they could not have fevered
Perfecto con V-ing
I could not have been fevering you could not have been fevering he could not have been fevering we could not have been fevering you could not have been fevering they could not have been fevering
Forma interrogativa
Forma simple
could I fever? could you fever? could he fever? could we fever? could you fever? could they fever?
Forma con V-ing
could I be fevering? could you be fevering? could he be fevering? could we be fevering? could you be fevering? could they be fevering?
Perfecto
could I have fevered? could you have fevered? could he have fevered? could we have fevered? could you have fevered? could they have fevered?
Perfecto con V-ing
could I have been fevering? could you have been fevering? could he have been fevering? could we have been fevering? could you have been fevering? could they have been fevering?
Forma interro-negativa
Forma simple
could I not fever? could you not fever? could he not fever? could we not fever? could you not fever? could they not fever?
Forma con V-ing
could I not be fevering? could you not be fevering? could he not be fevering? could we not be fevering? could you not be fevering? could they not be fevering?
Perfecto
could I not have fevered? could you not have fevered? could he not have fevered? could we not have fevered? could you not have fevered? could they not have fevered?
Perfecto con V-ing
could I not have been fevering? could you not have been fevering? could he not have been fevering? could we not have been fevering? could you not have been fevering? could they not have been fevering?