I could extract you could extract he could extract we could extract you could extract they could extract
Forma con V-ing
I could be extracting you could be extracting he could be extracting we could be extracting you could be extracting they could be extracting
Perfecto
I could have extracted you could have extracted he could have extracted we could have extracted you could have extracted they could have extracted
Perfecto con V-ing
I could have been extracting you could have been extracting he could have been extracting we could have been extracting you could have been extracting they could have been extracting
Negación
Forma simple
I could not extract you could not extract he could not extract we could not extract you could not extract they could not extract
Forma con V-ing
I could not be extracting you could not be extracting he could not be extracting we could not be extracting you could not be extracting they could not be extracting
Perfecto
I could not have extracted you could not have extracted he could not have extracted we could not have extracted you could not have extracted they could not have extracted
Perfecto con V-ing
I could not have been extracting you could not have been extracting he could not have been extracting we could not have been extracting you could not have been extracting they could not have been extracting
Forma interrogativa
Forma simple
could I extract? could you extract? could he extract? could we extract? could you extract? could they extract?
Forma con V-ing
could I be extracting? could you be extracting? could he be extracting? could we be extracting? could you be extracting? could they be extracting?
Perfecto
could I have extracted? could you have extracted? could he have extracted? could we have extracted? could you have extracted? could they have extracted?
Perfecto con V-ing
could I have been extracting? could you have been extracting? could he have been extracting? could we have been extracting? could you have been extracting? could they have been extracting?
Forma interro-negativa
Forma simple
could I not extract? could you not extract? could he not extract? could we not extract? could you not extract? could they not extract?
Forma con V-ing
could I not be extracting? could you not be extracting? could he not be extracting? could we not be extracting? could you not be extracting? could they not be extracting?
Perfecto
could I not have extracted? could you not have extracted? could he not have extracted? could we not have extracted? could you not have extracted? could they not have extracted?
Perfecto con V-ing
could I not have been extracting? could you not have been extracting? could he not have been extracting? could we not have been extracting? could you not have been extracting? could they not have been extracting?