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 couldn't cross-index you couldn't cross-index he couldn't cross-index we couldn't cross-index you couldn't cross-index they couldn't cross-index
V-ing form
I couldn't be cross-indexing you couldn't be cross-indexing he couldn't be cross-indexing we couldn't be cross-indexing you couldn't be cross-indexing they couldn't be cross-indexing
Perfect
I couldn't have cross-indexed you couldn't have cross-indexed he couldn't have cross-indexed we couldn't have cross-indexed you couldn't have cross-indexed they couldn't have cross-indexed
V-ing perfect
I couldn't have been cross-indexing you couldn't have been cross-indexing he couldn't have been cross-indexing we couldn't have been cross-indexing you couldn't have been cross-indexing they couldn't 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
couldn't I cross-index? couldn't you cross-index? couldn't he cross-index? couldn't we cross-index? couldn't you cross-index? couldn't they cross-index?
V-ing form
couldn't I be cross-indexing? couldn't you be cross-indexing? couldn't he be cross-indexing? couldn't we be cross-indexing? couldn't you be cross-indexing? couldn't they be cross-indexing?
Perfect
couldn't I have cross-indexed? couldn't you have cross-indexed? couldn't he have cross-indexed? couldn't we have cross-indexed? couldn't you have cross-indexed? couldn't they have cross-indexed?
V-ing perfect
couldn't I have been cross-indexing? couldn't you have been cross-indexing? couldn't he have been cross-indexing? couldn't we have been cross-indexing? couldn't you have been cross-indexing? couldn't they have been cross-indexing?