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 couldn't scum you couldn't scum he couldn't scum we couldn't scum you couldn't scum they couldn't scum	I couldn't be scumming you couldn't be scumming he couldn't be scumming we couldn't be scumming you couldn't be scumming they couldn't be scumming
Perfect	V-ing perfect
I couldn't have scummed you couldn't have scummed he couldn't have scummed we couldn't have scummed you couldn't have scummed they couldn't have scummed	I couldn't have been scumming you couldn't have been scumming he couldn't have been scumming we couldn't have been scumming you couldn't have been scumming they couldn't 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
couldn't I scum? couldn't you scum? couldn't he scum? couldn't we scum? couldn't you scum? couldn't they scum?	couldn't I be scumming? couldn't you be scumming? couldn't he be scumming? couldn't we be scumming? couldn't you be scumming? couldn't they be scumming?
Perfect	V-ing perfect
couldn't I have scummed? couldn't you have scummed? couldn't he have scummed? couldn't we have scummed? couldn't you have scummed? couldn't they have scummed?	couldn't I have been scumming? couldn't you have been scumming? couldn't he have been scumming? couldn't we have been scumming? couldn't you have been scumming? couldn't they have been scumming?