Atención, este verbo puede no existir, se da como ejemplo la conjugación.
Afirmación
Forma simple
I could stay up you could stay up she could stay up we could stay up you could stay up they could stay up
Forma con V-ing
I could be stay uping you could be stay uping she could be stay uping we could be stay uping you could be stay uping they could be stay uping
Perfecto
I could have stay uped you could have stay uped she could have stay uped we could have stay uped you could have stay uped they could have stay uped
Perfecto con V-ing
I could have been stay uping you could have been stay uping she could have been stay uping we could have been stay uping you could have been stay uping they could have been stay uping
Negación
Forma simple
I could not stay up you could not stay up she could not stay up we could not stay up you could not stay up they could not stay up
Forma con V-ing
I could not be stay uping you could not be stay uping she could not be stay uping we could not be stay uping you could not be stay uping they could not be stay uping
Perfecto
I could not have stay uped you could not have stay uped she could not have stay uped we could not have stay uped you could not have stay uped they could not have stay uped
Perfecto con V-ing
I could not have been stay uping you could not have been stay uping she could not have been stay uping we could not have been stay uping you could not have been stay uping they could not have been stay uping
Forma interrogativa
Forma simple
could I stay up? could you stay up? could she stay up? could we stay up? could you stay up? could they stay up?
Forma con V-ing
could I be stay uping? could you be stay uping? could she be stay uping? could we be stay uping? could you be stay uping? could they be stay uping?
Perfecto
could I have stay uped? could you have stay uped? could she have stay uped? could we have stay uped? could you have stay uped? could they have stay uped?
Perfecto con V-ing
could I have been stay uping? could you have been stay uping? could she have been stay uping? could we have been stay uping? could you have been stay uping? could they have been stay uping?
Forma interro-negativa
Forma simple
could I not stay up? could you not stay up? could she not stay up? could we not stay up? could you not stay up? could they not stay up?
Forma con V-ing
could I not be stay uping? could you not be stay uping? could she not be stay uping? could we not be stay uping? could you not be stay uping? could they not be stay uping?
Perfecto
could I not have stay uped? could you not have stay uped? could she not have stay uped? could we not have stay uped? could you not have stay uped? could they not have stay uped?
Perfecto con V-ing
could I not have been stay uping? could you not have been stay uping? could she not have been stay uping? could we not have been stay uping? could you not have been stay uping? could they not have been stay uping?