English verb conjugation
COULD SCUM

Regular verb: scum - scummed - scummed

Affirmation

Simple form	V-ing form
I could scum you could scum he could scum we could scum you could scum they could scum	I could be scumming you could be scumming he could be scumming we could be scumming you could be scumming they could be scumming
Perfect	V-ing perfect
I could have scummed you could have scummed he could have scummed we could have scummed you could have scummed they could have scummed	I could have been scumming you could have been scumming he could have been scumming we could have been scumming you could have been scumming they could have been scumming

Negation

Simple form	V-ing form
I could not scum you could not scum he could not scum we could not scum you could not scum they could not scum	I could not be scumming you could not be scumming he could not be scumming we could not be scumming you could not be scumming they could not be scumming
Perfect	V-ing perfect
I could not have scummed you could not have scummed he could not have scummed we could not have scummed you could not have scummed they could not have scummed	I could not have been scumming you could not have been scumming he could not have been scumming we could not have been scumming you could not have been scumming they could not have been scumming

Interrogative form

Simple form	V-ing form
could I scum? could you scum? could he scum? could we scum? could you scum? could they scum?	could I be scumming? could you be scumming? could he be scumming? could we be scumming? could you be scumming? could they be scumming?
Perfect	V-ing perfect
could I have scummed? could you have scummed? could he have scummed? could we have scummed? could you have scummed? could they have scummed?	could I have been scumming? could you have been scumming? could he have been scumming? could we have been scumming? could you have been scumming? could they have been scumming?

Interro-negative form

Simple form	V-ing form
could I not scum? could you not scum? could he not scum? could we not scum? could you not scum? could they not scum?	could I not be scumming? could you not be scumming? could he not be scumming? could we not be scumming? could you not be scumming? could they not be scumming?
Perfect	V-ing perfect
could I not have scummed? could you not have scummed? could he not have scummed? could we not have scummed? could you not have scummed? could they not have scummed?	could I not have been scumming? could you not have been scumming? could he not have been scumming? could we not have been scumming? could you not have been scumming? could they not have been scumming?