I could index you could index he could index we could index you could index they could index
Forma con V-ing
I could be indexing you could be indexing he could be indexing we could be indexing you could be indexing they could be indexing
Perfecto
I could have indexed you could have indexed he could have indexed we could have indexed you could have indexed they could have indexed
Perfecto con V-ing
I could have been indexing you could have been indexing he could have been indexing we could have been indexing you could have been indexing they could have been indexing
Negación
Forma simple
I could not index you could not index he could not index we could not index you could not index they could not index
Forma con V-ing
I could not be indexing you could not be indexing he could not be indexing we could not be indexing you could not be indexing they could not be indexing
Perfecto
I could not have indexed you could not have indexed he could not have indexed we could not have indexed you could not have indexed they could not have indexed
Perfecto con V-ing
I could not have been indexing you could not have been indexing he could not have been indexing we could not have been indexing you could not have been indexing they could not have been indexing
Forma interrogativa
Forma simple
could I index? could you index? could he index? could we index? could you index? could they index?
Forma con V-ing
could I be indexing? could you be indexing? could he be indexing? could we be indexing? could you be indexing? could they be indexing?
Perfecto
could I have indexed? could you have indexed? could he have indexed? could we have indexed? could you have indexed? could they have indexed?
Perfecto con V-ing
could I have been indexing? could you have been indexing? could he have been indexing? could we have been indexing? could you have been indexing? could they have been indexing?
Forma interro-negativa
Forma simple
could I not index? could you not index? could he not index? could we not index? could you not index? could they not index?
Forma con V-ing
could I not be indexing? could you not be indexing? could he not be indexing? could we not be indexing? could you not be indexing? could they not be indexing?
Perfecto
could I not have indexed? could you not have indexed? could he not have indexed? could we not have indexed? could you not have indexed? could they not have indexed?
Perfecto con V-ing
could I not have been indexing? could you not have been indexing? could he not have been indexing? could we not have been indexing? could you not have been indexing? could they not have been indexing?