English verb conjugation
COULD SLUMBER

Regular verb: slumber - slumbered - slumbered

Affirmation

Simple form	V-ing form
I could slumber you could slumber he could slumber we could slumber you could slumber they could slumber	I could be slumbering you could be slumbering he could be slumbering we could be slumbering you could be slumbering they could be slumbering
Perfect	V-ing perfect
I could have slumbered you could have slumbered he could have slumbered we could have slumbered you could have slumbered they could have slumbered	I could have been slumbering you could have been slumbering he could have been slumbering we could have been slumbering you could have been slumbering they could have been slumbering

Negation

Simple form	V-ing form
I could not slumber you could not slumber he could not slumber we could not slumber you could not slumber they could not slumber	I could not be slumbering you could not be slumbering he could not be slumbering we could not be slumbering you could not be slumbering they could not be slumbering
Perfect	V-ing perfect
I could not have slumbered you could not have slumbered he could not have slumbered we could not have slumbered you could not have slumbered they could not have slumbered	I could not have been slumbering you could not have been slumbering he could not have been slumbering we could not have been slumbering you could not have been slumbering they could not have been slumbering

Interrogative form

Simple form	V-ing form
could I slumber? could you slumber? could he slumber? could we slumber? could you slumber? could they slumber?	could I be slumbering? could you be slumbering? could he be slumbering? could we be slumbering? could you be slumbering? could they be slumbering?
Perfect	V-ing perfect
could I have slumbered? could you have slumbered? could he have slumbered? could we have slumbered? could you have slumbered? could they have slumbered?	could I have been slumbering? could you have been slumbering? could he have been slumbering? could we have been slumbering? could you have been slumbering? could they have been slumbering?

Interro-negative form

Simple form	V-ing form
could I not slumber? could you not slumber? could he not slumber? could we not slumber? could you not slumber? could they not slumber?	could I not be slumbering? could you not be slumbering? could he not be slumbering? could we not be slumbering? could you not be slumbering? could they not be slumbering?
Perfect	V-ing perfect
could I not have slumbered? could you not have slumbered? could he not have slumbered? could we not have slumbered? could you not have slumbered? could they not have slumbered?	could I not have been slumbering? could you not have been slumbering? could he not have been slumbering? could we not have been slumbering? could you not have been slumbering? could they not have been slumbering?