English verb conjugation
COULD SCUMBLE

Regular verb: scumble - scumbled - scumbled

Affirmation

Simple form	V-ing form
I could scumble you could scumble he could scumble we could scumble you could scumble they could scumble	I could be scumbling you could be scumbling he could be scumbling we could be scumbling you could be scumbling they could be scumbling
Perfect	V-ing perfect
I could have scumbled you could have scumbled he could have scumbled we could have scumbled you could have scumbled they could have scumbled	I could have been scumbling you could have been scumbling he could have been scumbling we could have been scumbling you could have been scumbling they could have been scumbling

Negation

Simple form	V-ing form
I couldn't scumble you couldn't scumble he couldn't scumble we couldn't scumble you couldn't scumble they couldn't scumble	I couldn't be scumbling you couldn't be scumbling he couldn't be scumbling we couldn't be scumbling you couldn't be scumbling they couldn't be scumbling
Perfect	V-ing perfect
I couldn't have scumbled you couldn't have scumbled he couldn't have scumbled we couldn't have scumbled you couldn't have scumbled they couldn't have scumbled	I couldn't have been scumbling you couldn't have been scumbling he couldn't have been scumbling we couldn't have been scumbling you couldn't have been scumbling they couldn't have been scumbling

Interrogative form

Simple form	V-ing form
could I scumble? could you scumble? could he scumble? could we scumble? could you scumble? could they scumble?	could I be scumbling? could you be scumbling? could he be scumbling? could we be scumbling? could you be scumbling? could they be scumbling?
Perfect	V-ing perfect
could I have scumbled? could you have scumbled? could he have scumbled? could we have scumbled? could you have scumbled? could they have scumbled?	could I have been scumbling? could you have been scumbling? could he have been scumbling? could we have been scumbling? could you have been scumbling? could they have been scumbling?

Interro-negative form

Simple form	V-ing form
couldn't I scumble? couldn't you scumble? couldn't he scumble? couldn't we scumble? couldn't you scumble? couldn't they scumble?	couldn't I be scumbling? couldn't you be scumbling? couldn't he be scumbling? couldn't we be scumbling? couldn't you be scumbling? couldn't they be scumbling?
Perfect	V-ing perfect
couldn't I have scumbled? couldn't you have scumbled? couldn't he have scumbled? couldn't we have scumbled? couldn't you have scumbled? couldn't they have scumbled?	couldn't I have been scumbling? couldn't you have been scumbling? couldn't he have been scumbling? couldn't we have been scumbling? couldn't you have been scumbling? couldn't they have been scumbling?