I could ret you could ret he could ret we could ret you could ret they could ret
Forma con V-ing
I could be retting you could be retting he could be retting we could be retting you could be retting they could be retting
Perfecto
I could have retted you could have retted he could have retted we could have retted you could have retted they could have retted
Perfecto con V-ing
I could have been retting you could have been retting he could have been retting we could have been retting you could have been retting they could have been retting
Negación
Forma simple
I could not ret you could not ret he could not ret we could not ret you could not ret they could not ret
Forma con V-ing
I could not be retting you could not be retting he could not be retting we could not be retting you could not be retting they could not be retting
Perfecto
I could not have retted you could not have retted he could not have retted we could not have retted you could not have retted they could not have retted
Perfecto con V-ing
I could not have been retting you could not have been retting he could not have been retting we could not have been retting you could not have been retting they could not have been retting
Forma interrogativa
Forma simple
could I ret? could you ret? could he ret? could we ret? could you ret? could they ret?
Forma con V-ing
could I be retting? could you be retting? could he be retting? could we be retting? could you be retting? could they be retting?
Perfecto
could I have retted? could you have retted? could he have retted? could we have retted? could you have retted? could they have retted?
Perfecto con V-ing
could I have been retting? could you have been retting? could he have been retting? could we have been retting? could you have been retting? could they have been retting?
Forma interro-negativa
Forma simple
could I not ret? could you not ret? could he not ret? could we not ret? could you not ret? could they not ret?
Forma con V-ing
could I not be retting? could you not be retting? could he not be retting? could we not be retting? could you not be retting? could they not be retting?
Perfecto
could I not have retted? could you not have retted? could he not have retted? could we not have retted? could you not have retted? could they not have retted?
Perfecto con V-ing
could I not have been retting? could you not have been retting? could he not have been retting? could we not have been retting? could you not have been retting? could they not have been retting?