I could crack you could crack he could crack we could crack you could crack they could crack
Forma con V-ing
I could be cracking you could be cracking he could be cracking we could be cracking you could be cracking they could be cracking
Perfecto
I could have cracked you could have cracked he could have cracked we could have cracked you could have cracked they could have cracked
Perfecto con V-ing
I could have been cracking you could have been cracking he could have been cracking we could have been cracking you could have been cracking they could have been cracking
Negación
Forma simple
I could not crack you could not crack he could not crack we could not crack you could not crack they could not crack
Forma con V-ing
I could not be cracking you could not be cracking he could not be cracking we could not be cracking you could not be cracking they could not be cracking
Perfecto
I could not have cracked you could not have cracked he could not have cracked we could not have cracked you could not have cracked they could not have cracked
Perfecto con V-ing
I could not have been cracking you could not have been cracking he could not have been cracking we could not have been cracking you could not have been cracking they could not have been cracking
Forma interrogativa
Forma simple
could I crack? could you crack? could he crack? could we crack? could you crack? could they crack?
Forma con V-ing
could I be cracking? could you be cracking? could he be cracking? could we be cracking? could you be cracking? could they be cracking?
Perfecto
could I have cracked? could you have cracked? could he have cracked? could we have cracked? could you have cracked? could they have cracked?
Perfecto con V-ing
could I have been cracking? could you have been cracking? could he have been cracking? could we have been cracking? could you have been cracking? could they have been cracking?
Forma interro-negativa
Forma simple
could I not crack? could you not crack? could he not crack? could we not crack? could you not crack? could they not crack?
Forma con V-ing
could I not be cracking? could you not be cracking? could he not be cracking? could we not be cracking? could you not be cracking? could they not be cracking?
Perfecto
could I not have cracked? could you not have cracked? could he not have cracked? could we not have cracked? could you not have cracked? could they not have cracked?
Perfecto con V-ing
could I not have been cracking? could you not have been cracking? could he not have been cracking? could we not have been cracking? could you not have been cracking? could they not have been cracking?