I could structure you could structure he could structure we could structure you could structure they could structure
V-ing form
I could be structuring you could be structuring he could be structuring we could be structuring you could be structuring they could be structuring
Perfect
I could have structured you could have structured he could have structured we could have structured you could have structured they could have structured
V-ing perfect
I could have been structuring you could have been structuring he could have been structuring we could have been structuring you could have been structuring they could have been structuring
Negation
Simple form
I could not structure you could not structure he could not structure we could not structure you could not structure they could not structure
V-ing form
I could not be structuring you could not be structuring he could not be structuring we could not be structuring you could not be structuring they could not be structuring
Perfect
I could not have structured you could not have structured he could not have structured we could not have structured you could not have structured they could not have structured
V-ing perfect
I could not have been structuring you could not have been structuring he could not have been structuring we could not have been structuring you could not have been structuring they could not have been structuring
Interrogative form
Simple form
could I structure? could you structure? could he structure? could we structure? could you structure? could they structure?
V-ing form
could I be structuring? could you be structuring? could he be structuring? could we be structuring? could you be structuring? could they be structuring?
Perfect
could I have structured? could you have structured? could he have structured? could we have structured? could you have structured? could they have structured?
V-ing perfect
could I have been structuring? could you have been structuring? could he have been structuring? could we have been structuring? could you have been structuring? could they have been structuring?
Interro-negative form
Simple form
could I not structure? could you not structure? could he not structure? could we not structure? could you not structure? could they not structure?
V-ing form
could I not be structuring? could you not be structuring? could he not be structuring? could we not be structuring? could you not be structuring? could they not be structuring?
Perfect
could I not have structured? could you not have structured? could he not have structured? could we not have structured? could you not have structured? could they not have structured?
V-ing perfect
could I not have been structuring? could you not have been structuring? could he not have been structuring? could we not have been structuring? could you not have been structuring? could they not have been structuring?