English verb conjugation
COULD SCUPPER

Regular verb: scupper - scuppered - scuppered

Affirmation

Simple form	V-ing form
I could scupper you could scupper she could scupper we could scupper you could scupper they could scupper	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	V-ing 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	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	V-ing form
I couldn't scupper you couldn't scupper she couldn't scupper we couldn't scupper you couldn't scupper they couldn't scupper	I couldn't be scuppering you couldn't be scuppering she couldn't be scuppering we couldn't be scuppering you couldn't be scuppering they couldn't be scuppering
Perfect	V-ing perfect
I couldn't have scuppered you couldn't have scuppered she couldn't have scuppered we couldn't have scuppered you couldn't have scuppered they couldn't have scuppered	I couldn't have been scuppering you couldn't have been scuppering she couldn't have been scuppering we couldn't have been scuppering you couldn't have been scuppering they couldn't have been scuppering

Interrogative form

Simple form	V-ing form
could I scupper? could you scupper? could she scupper? could we scupper? could you scupper? could they scupper?	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	V-ing 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?	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	V-ing form
couldn't I scupper? couldn't you scupper? couldn't she scupper? couldn't we scupper? couldn't you scupper? couldn't they scupper?	couldn't I be scuppering? couldn't you be scuppering? couldn't she be scuppering? couldn't we be scuppering? couldn't you be scuppering? couldn't they be scuppering?
Perfect	V-ing perfect
couldn't I have scuppered? couldn't you have scuppered? couldn't she have scuppered? couldn't we have scuppered? couldn't you have scuppered? couldn't they have scuppered?	couldn't I have been scuppering? couldn't you have been scuppering? couldn't she have been scuppering? couldn't we have been scuppering? couldn't you have been scuppering? couldn't they have been scuppering?