I could grunt you could grunt he could grunt we could grunt you could grunt they could grunt
Forma con V-ing
I could be grunting you could be grunting he could be grunting we could be grunting you could be grunting they could be grunting
Perfecto
I could have grunted you could have grunted he could have grunted we could have grunted you could have grunted they could have grunted
Perfecto con V-ing
I could have been grunting you could have been grunting he could have been grunting we could have been grunting you could have been grunting they could have been grunting
Negación
Forma simple
I could not grunt you could not grunt he could not grunt we could not grunt you could not grunt they could not grunt
Forma con V-ing
I could not be grunting you could not be grunting he could not be grunting we could not be grunting you could not be grunting they could not be grunting
Perfecto
I could not have grunted you could not have grunted he could not have grunted we could not have grunted you could not have grunted they could not have grunted
Perfecto con V-ing
I could not have been grunting you could not have been grunting he could not have been grunting we could not have been grunting you could not have been grunting they could not have been grunting
Forma interrogativa
Forma simple
could I grunt? could you grunt? could he grunt? could we grunt? could you grunt? could they grunt?
Forma con V-ing
could I be grunting? could you be grunting? could he be grunting? could we be grunting? could you be grunting? could they be grunting?
Perfecto
could I have grunted? could you have grunted? could he have grunted? could we have grunted? could you have grunted? could they have grunted?
Perfecto con V-ing
could I have been grunting? could you have been grunting? could he have been grunting? could we have been grunting? could you have been grunting? could they have been grunting?
Forma interro-negativa
Forma simple
could I not grunt? could you not grunt? could he not grunt? could we not grunt? could you not grunt? could they not grunt?
Forma con V-ing
could I not be grunting? could you not be grunting? could he not be grunting? could we not be grunting? could you not be grunting? could they not be grunting?
Perfecto
could I not have grunted? could you not have grunted? could he not have grunted? could we not have grunted? could you not have grunted? could they not have grunted?
Perfecto con V-ing
could I not have been grunting? could you not have been grunting? could he not have been grunting? could we not have been grunting? could you not have been grunting? could they not have been grunting?