I could cross-index you could cross-index he could cross-index we could cross-index you could cross-index they could cross-index
V-ing form
I could be cross-indexing you could be cross-indexing he could be cross-indexing we could be cross-indexing you could be cross-indexing they could be cross-indexing
Perfect
I could have cross-indexed you could have cross-indexed he could have cross-indexed we could have cross-indexed you could have cross-indexed they could have cross-indexed
V-ing perfect
I could have been cross-indexing you could have been cross-indexing he could have been cross-indexing we could have been cross-indexing you could have been cross-indexing they could have been cross-indexing
Negation
Simple form
I could not cross-index you could not cross-index he could not cross-index we could not cross-index you could not cross-index they could not cross-index
V-ing form
I could not be cross-indexing you could not be cross-indexing he could not be cross-indexing we could not be cross-indexing you could not be cross-indexing they could not be cross-indexing
Perfect
I could not have cross-indexed you could not have cross-indexed he could not have cross-indexed we could not have cross-indexed you could not have cross-indexed they could not have cross-indexed
V-ing perfect
I could not have been cross-indexing you could not have been cross-indexing he could not have been cross-indexing we could not have been cross-indexing you could not have been cross-indexing they could not have been cross-indexing
Interrogative form
Simple form
could I cross-index? could you cross-index? could he cross-index? could we cross-index? could you cross-index? could they cross-index?
V-ing form
could I be cross-indexing? could you be cross-indexing? could he be cross-indexing? could we be cross-indexing? could you be cross-indexing? could they be cross-indexing?
Perfect
could I have cross-indexed? could you have cross-indexed? could he have cross-indexed? could we have cross-indexed? could you have cross-indexed? could they have cross-indexed?
V-ing perfect
could I have been cross-indexing? could you have been cross-indexing? could he have been cross-indexing? could we have been cross-indexing? could you have been cross-indexing? could they have been cross-indexing?
Interro-negative form
Simple form
could I not cross-index? could you not cross-index? could he not cross-index? could we not cross-index? could you not cross-index? could they not cross-index?
V-ing form
could I not be cross-indexing? could you not be cross-indexing? could he not be cross-indexing? could we not be cross-indexing? could you not be cross-indexing? could they not be cross-indexing?
Perfect
could I not have cross-indexed? could you not have cross-indexed? could he not have cross-indexed? could we not have cross-indexed? could you not have cross-indexed? could they not have cross-indexed?
V-ing perfect
could I not have been cross-indexing? could you not have been cross-indexing? could he not have been cross-indexing? could we not have been cross-indexing? could you not have been cross-indexing? could they not have been cross-indexing?