I could discern you could discern she could discern we could discern you could discern they could discern
Forma con V-ing
I could be discerning you could be discerning she could be discerning we could be discerning you could be discerning they could be discerning
Perfecto
I could have discerned you could have discerned she could have discerned we could have discerned you could have discerned they could have discerned
Perfecto con V-ing
I could have been discerning you could have been discerning she could have been discerning we could have been discerning you could have been discerning they could have been discerning
Negación
Forma simple
I could not discern you could not discern she could not discern we could not discern you could not discern they could not discern
Forma con V-ing
I could not be discerning you could not be discerning she could not be discerning we could not be discerning you could not be discerning they could not be discerning
Perfecto
I could not have discerned you could not have discerned she could not have discerned we could not have discerned you could not have discerned they could not have discerned
Perfecto con V-ing
I could not have been discerning you could not have been discerning she could not have been discerning we could not have been discerning you could not have been discerning they could not have been discerning
Forma interrogativa
Forma simple
could I discern? could you discern? could she discern? could we discern? could you discern? could they discern?
Forma con V-ing
could I be discerning? could you be discerning? could she be discerning? could we be discerning? could you be discerning? could they be discerning?
Perfecto
could I have discerned? could you have discerned? could she have discerned? could we have discerned? could you have discerned? could they have discerned?
Perfecto con V-ing
could I have been discerning? could you have been discerning? could she have been discerning? could we have been discerning? could you have been discerning? could they have been discerning?
Forma interro-negativa
Forma simple
could I not discern? could you not discern? could she not discern? could we not discern? could you not discern? could they not discern?
Forma con V-ing
could I not be discerning? could you not be discerning? could she not be discerning? could we not be discerning? could you not be discerning? could they not be discerning?
Perfecto
could I not have discerned? could you not have discerned? could she not have discerned? could we not have discerned? could you not have discerned? could they not have discerned?
Perfecto con V-ing
could I not have been discerning? could you not have been discerning? could she not have been discerning? could we not have been discerning? could you not have been discerning? could they not have been discerning?