I could scupper you could scupper she could scupper we could scupper you could scupper they could scupper
V-ing form
I could be scuppering you could be scuppering she could be scuppering we could be scuppering you could be scuppering they could be scuppering
Perfect
I could have scuppered you could have scuppered she could have scuppered we could have scuppered you could have scuppered they could have scuppered
V-ing perfect
I could have been scuppering you could have been scuppering she could have been scuppering we could have been scuppering you could have been scuppering they could have been scuppering
Negation
Simple form
I could not scupper you could not scupper she could not scupper we could not scupper you could not scupper they could not scupper
V-ing form
I could not be scuppering you could not be scuppering she could not be scuppering we could not be scuppering you could not be scuppering they could not be scuppering
Perfect
I could not have scuppered you could not have scuppered she could not have scuppered we could not have scuppered you could not have scuppered they could not have scuppered
V-ing perfect
I could not have been scuppering you could not have been scuppering she could not have been scuppering we could not have been scuppering you could not have been scuppering they could not have been scuppering
Interrogative form
Simple form
could I scupper? could you scupper? could she scupper? could we scupper? could you scupper? could they scupper?
V-ing form
could I be scuppering? could you be scuppering? could she be scuppering? could we be scuppering? could you be scuppering? could they be scuppering?
Perfect
could I have scuppered? could you have scuppered? could she have scuppered? could we have scuppered? could you have scuppered? could they have scuppered?
V-ing perfect
could I have been scuppering? could you have been scuppering? could she have been scuppering? could we have been scuppering? could you have been scuppering? could they have been scuppering?
Interro-negative form
Simple form
could I not scupper? could you not scupper? could she not scupper? could we not scupper? could you not scupper? could they not scupper?
V-ing form
could I not be scuppering? could you not be scuppering? could she not be scuppering? could we not be scuppering? could you not be scuppering? could they not be scuppering?
Perfect
could I not have scuppered? could you not have scuppered? could she not have scuppered? could we not have scuppered? could you not have scuppered? could they not have scuppered?
V-ing perfect
could I not have been scuppering? could you not have been scuppering? could she not have been scuppering? could we not have been scuppering? could you not have been scuppering? could they not have been scuppering?