I could group you could group he could group we could group you could group they could group
Forma con V-ing
I could be grouping you could be grouping he could be grouping we could be grouping you could be grouping they could be grouping
Perfecto
I could have grouped you could have grouped he could have grouped we could have grouped you could have grouped they could have grouped
Perfecto con V-ing
I could have been grouping you could have been grouping he could have been grouping we could have been grouping you could have been grouping they could have been grouping
Negación
Forma simple
I could not group you could not group he could not group we could not group you could not group they could not group
Forma con V-ing
I could not be grouping you could not be grouping he could not be grouping we could not be grouping you could not be grouping they could not be grouping
Perfecto
I could not have grouped you could not have grouped he could not have grouped we could not have grouped you could not have grouped they could not have grouped
Perfecto con V-ing
I could not have been grouping you could not have been grouping he could not have been grouping we could not have been grouping you could not have been grouping they could not have been grouping
Forma interrogativa
Forma simple
could I group? could you group? could he group? could we group? could you group? could they group?
Forma con V-ing
could I be grouping? could you be grouping? could he be grouping? could we be grouping? could you be grouping? could they be grouping?
Perfecto
could I have grouped? could you have grouped? could he have grouped? could we have grouped? could you have grouped? could they have grouped?
Perfecto con V-ing
could I have been grouping? could you have been grouping? could he have been grouping? could we have been grouping? could you have been grouping? could they have been grouping?
Forma interro-negativa
Forma simple
could I not group? could you not group? could he not group? could we not group? could you not group? could they not group?
Forma con V-ing
could I not be grouping? could you not be grouping? could he not be grouping? could we not be grouping? could you not be grouping? could they not be grouping?
Perfecto
could I not have grouped? could you not have grouped? could he not have grouped? could we not have grouped? could you not have grouped? could they not have grouped?
Perfecto con V-ing
could I not have been grouping? could you not have been grouping? could he not have been grouping? could we not have been grouping? could you not have been grouping? could they not have been grouping?