I could discover you could discover he could discover we could discover you could discover they could discover
Forma con V-ing
I could be discovering you could be discovering he could be discovering we could be discovering you could be discovering they could be discovering
Perfecto
I could have discovered you could have discovered he could have discovered we could have discovered you could have discovered they could have discovered
Perfecto con V-ing
I could have been discovering you could have been discovering he could have been discovering we could have been discovering you could have been discovering they could have been discovering
Negación
Forma simple
I could not discover you could not discover he could not discover we could not discover you could not discover they could not discover
Forma con V-ing
I could not be discovering you could not be discovering he could not be discovering we could not be discovering you could not be discovering they could not be discovering
Perfecto
I could not have discovered you could not have discovered he could not have discovered we could not have discovered you could not have discovered they could not have discovered
Perfecto con V-ing
I could not have been discovering you could not have been discovering he could not have been discovering we could not have been discovering you could not have been discovering they could not have been discovering
Forma interrogativa
Forma simple
could I discover? could you discover? could he discover? could we discover? could you discover? could they discover?
Forma con V-ing
could I be discovering? could you be discovering? could he be discovering? could we be discovering? could you be discovering? could they be discovering?
Perfecto
could I have discovered? could you have discovered? could he have discovered? could we have discovered? could you have discovered? could they have discovered?
Perfecto con V-ing
could I have been discovering? could you have been discovering? could he have been discovering? could we have been discovering? could you have been discovering? could they have been discovering?
Forma interro-negativa
Forma simple
could I not discover? could you not discover? could he not discover? could we not discover? could you not discover? could they not discover?
Forma con V-ing
could I not be discovering? could you not be discovering? could he not be discovering? could we not be discovering? could you not be discovering? could they not be discovering?
Perfecto
could I not have discovered? could you not have discovered? could he not have discovered? could we not have discovered? could you not have discovered? could they not have discovered?
Perfecto con V-ing
could I not have been discovering? could you not have been discovering? could he not have been discovering? could we not have been discovering? could you not have been discovering? could they not have been discovering?