I could perdure you could perdure she could perdure we could perdure you could perdure they could perdure
Forma con V-ing
I could be perduring you could be perduring she could be perduring we could be perduring you could be perduring they could be perduring
Perfecto
I could have perdured you could have perdured she could have perdured we could have perdured you could have perdured they could have perdured
Perfecto con V-ing
I could have been perduring you could have been perduring she could have been perduring we could have been perduring you could have been perduring they could have been perduring
Negación
Forma simple
I could not perdure you could not perdure she could not perdure we could not perdure you could not perdure they could not perdure
Forma con V-ing
I could not be perduring you could not be perduring she could not be perduring we could not be perduring you could not be perduring they could not be perduring
Perfecto
I could not have perdured you could not have perdured she could not have perdured we could not have perdured you could not have perdured they could not have perdured
Perfecto con V-ing
I could not have been perduring you could not have been perduring she could not have been perduring we could not have been perduring you could not have been perduring they could not have been perduring
Forma interrogativa
Forma simple
could I perdure? could you perdure? could she perdure? could we perdure? could you perdure? could they perdure?
Forma con V-ing
could I be perduring? could you be perduring? could she be perduring? could we be perduring? could you be perduring? could they be perduring?
Perfecto
could I have perdured? could you have perdured? could she have perdured? could we have perdured? could you have perdured? could they have perdured?
Perfecto con V-ing
could I have been perduring? could you have been perduring? could she have been perduring? could we have been perduring? could you have been perduring? could they have been perduring?
Forma interro-negativa
Forma simple
could I not perdure? could you not perdure? could she not perdure? could we not perdure? could you not perdure? could they not perdure?
Forma con V-ing
could I not be perduring? could you not be perduring? could she not be perduring? could we not be perduring? could you not be perduring? could they not be perduring?
Perfecto
could I not have perdured? could you not have perdured? could she not have perdured? could we not have perdured? could you not have perdured? could they not have perdured?
Perfecto con V-ing
could I not have been perduring? could you not have been perduring? could she not have been perduring? could we not have been perduring? could you not have been perduring? could they not have been perduring?