I could specify you could specify he could specify we could specify you could specify they could specify
Forma con V-ing
I could be specifying you could be specifying he could be specifying we could be specifying you could be specifying they could be specifying
Perfecto
I could have specified you could have specified he could have specified we could have specified you could have specified they could have specified
Perfecto con V-ing
I could have been specifying you could have been specifying he could have been specifying we could have been specifying you could have been specifying they could have been specifying
Negación
Forma simple
I could not specify you could not specify he could not specify we could not specify you could not specify they could not specify
Forma con V-ing
I could not be specifying you could not be specifying he could not be specifying we could not be specifying you could not be specifying they could not be specifying
Perfecto
I could not have specified you could not have specified he could not have specified we could not have specified you could not have specified they could not have specified
Perfecto con V-ing
I could not have been specifying you could not have been specifying he could not have been specifying we could not have been specifying you could not have been specifying they could not have been specifying
Forma interrogativa
Forma simple
could I specify? could you specify? could he specify? could we specify? could you specify? could they specify?
Forma con V-ing
could I be specifying? could you be specifying? could he be specifying? could we be specifying? could you be specifying? could they be specifying?
Perfecto
could I have specified? could you have specified? could he have specified? could we have specified? could you have specified? could they have specified?
Perfecto con V-ing
could I have been specifying? could you have been specifying? could he have been specifying? could we have been specifying? could you have been specifying? could they have been specifying?
Forma interro-negativa
Forma simple
could I not specify? could you not specify? could he not specify? could we not specify? could you not specify? could they not specify?
Forma con V-ing
could I not be specifying? could you not be specifying? could he not be specifying? could we not be specifying? could you not be specifying? could they not be specifying?
Perfecto
could I not have specified? could you not have specified? could he not have specified? could we not have specified? could you not have specified? could they not have specified?
Perfecto con V-ing
could I not have been specifying? could you not have been specifying? could he not have been specifying? could we not have been specifying? could you not have been specifying? could they not have been specifying?