I could guess you could guess she could guess we could guess you could guess they could guess
Forma con V-ing
I could be guessing you could be guessing she could be guessing we could be guessing you could be guessing they could be guessing
Perfecto
I could have guessed you could have guessed she could have guessed we could have guessed you could have guessed they could have guessed
Perfecto con V-ing
I could have been guessing you could have been guessing she could have been guessing we could have been guessing you could have been guessing they could have been guessing
Negación
Forma simple
I could not guess you could not guess she could not guess we could not guess you could not guess they could not guess
Forma con V-ing
I could not be guessing you could not be guessing she could not be guessing we could not be guessing you could not be guessing they could not be guessing
Perfecto
I could not have guessed you could not have guessed she could not have guessed we could not have guessed you could not have guessed they could not have guessed
Perfecto con V-ing
I could not have been guessing you could not have been guessing she could not have been guessing we could not have been guessing you could not have been guessing they could not have been guessing
Forma interrogativa
Forma simple
could I guess? could you guess? could she guess? could we guess? could you guess? could they guess?
Forma con V-ing
could I be guessing? could you be guessing? could she be guessing? could we be guessing? could you be guessing? could they be guessing?
Perfecto
could I have guessed? could you have guessed? could she have guessed? could we have guessed? could you have guessed? could they have guessed?
Perfecto con V-ing
could I have been guessing? could you have been guessing? could she have been guessing? could we have been guessing? could you have been guessing? could they have been guessing?
Forma interro-negativa
Forma simple
could I not guess? could you not guess? could she not guess? could we not guess? could you not guess? could they not guess?
Forma con V-ing
could I not be guessing? could you not be guessing? could she not be guessing? could we not be guessing? could you not be guessing? could they not be guessing?
Perfecto
could I not have guessed? could you not have guessed? could she not have guessed? could we not have guessed? could you not have guessed? could they not have guessed?
Perfecto con V-ing
could I not have been guessing? could you not have been guessing? could she not have been guessing? could we not have been guessing? could you not have been guessing? could they not have been guessing?