I could stay you could stay he could stay we could stay you could stay they could stay
Forma com V-ing
I could be staying you could be staying he could be staying we could be staying you could be staying they could be staying
Perfeito
I could have stayed you could have stayed he could have stayed we could have stayed you could have stayed they could have stayed
Perfeito com V-ing
I could have been staying you could have been staying he could have been staying we could have been staying you could have been staying they could have been staying
Negação
Forma simple
I could not stay you could not stay he could not stay we could not stay you could not stay they could not stay
Forma com V-ing
I could not be staying you could not be staying he could not be staying we could not be staying you could not be staying they could not be staying
Perfeito
I could not have stayed you could not have stayed he could not have stayed we could not have stayed you could not have stayed they could not have stayed
Perfeito com V-ing
I could not have been staying you could not have been staying he could not have been staying we could not have been staying you could not have been staying they could not have been staying
Forma interrogativa
Forma simple
could I stay? could you stay? could he stay? could we stay? could you stay? could they stay?
Forma com V-ing
could I be staying? could you be staying? could he be staying? could we be staying? could you be staying? could they be staying?
Perfeito
could I have stayed? could you have stayed? could he have stayed? could we have stayed? could you have stayed? could they have stayed?
Perfeito com V-ing
could I have been staying? could you have been staying? could he have been staying? could we have been staying? could you have been staying? could they have been staying?
Forma interro-Negação
Forma simple
could I not stay? could you not stay? could he not stay? could we not stay? could you not stay? could they not stay?
Forma com V-ing
could I not be staying? could you not be staying? could he not be staying? could we not be staying? could you not be staying? could they not be staying?
Perfeito
could I not have stayed? could you not have stayed? could he not have stayed? could we not have stayed? could you not have stayed? could they not have stayed?
Perfeito com V-ing
could I not have been staying? could you not have been staying? could he not have been staying? could we not have been staying? could you not have been staying? could they not have been staying?