must scupper
Regular verb: scupper - scuppered- scuppered

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not scupper
you must not scupper
he must not scupper
we must not scupper
you must not scupper
they must not scupper 	I must not be scuppering
you must not be scuppering
he must not be scuppering
we must not be scuppering
you must not be scuppering
they must not be scuppering	I must not have scuppered
you must not have scuppered
he must not have scuppered
we must not have scuppered
you must not have scuppered
they must not have scuppered	I must not have been scuppering
you must not have been scuppering
he must not have been scuppering
we must not have been scuppering
you must not have been scuppering
they must not have been scuppering	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not scupper?
must you not scupper?
must he not scupper?
must we not scupper?
must you not scupper?
must they not scupper? 	must I not be scuppering?
must you not be scuppering?
must he not be scuppering?
must we not be scuppering?
must you not be scuppering?
must they not be scuppering? 	must I not have scuppered?
must you not have scuppered?
must he not have scuppered?
must we not have scuppered?
must you not have scuppered?
must they not have scuppered? 	must I not have been scuppering?
must you not have been scuppering?
must he not have been scuppering?
must we not have been scuppering?
must you not have been scuppering?
must they not have been scuppering?