may scupper
Regular verb: scupper - scuppered- scuppered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may scupper
you may scupper
she may scupper
we may scupper
you may scupper
they may scupper 	I may be scuppering
you may be scuppering
she may be scuppering
we may be scuppering
you may be scuppering
they may be scuppering	I may have scuppered
you may have scuppered
she may have scuppered
we may have scuppered
you may have scuppered
they may have scuppered	I may have been scuppering
you may have been scuppering
she may have been scuppering
we may have been scuppering
you may have been scuppering
they may have been scuppering	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I scupper?
may you scupper?
may she scupper?
may we scupper?
may you scupper?
may they scupper? 	may I be scuppering?
may you be scuppering?
may she be scuppering?
may we be scuppering?
may you be scuppering?
may they be scuppering? 	may I have scuppered?
may you have scuppered?
may she have scuppered?
may we have scuppered?
may you have scuppered?
may they have scuppered? 	may I have been scuppering?
may you have been scuppering?
may she have been scuppering?
may we have been scuppering?
may you have been scuppering?
may they have been scuppering? 	

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