I can slumber you can slumber she can slumber we can slumber you can slumber they can slumber
V-ing form
I can be slumbering you can be slumbering she can be slumbering we can be slumbering you can be slumbering they can be slumbering
Perfect
I can have slumbered you can have slumbered she can have slumbered we can have slumbered you can have slumbered they can have slumbered
V-ing perfect
I can have been slumbering you can have been slumbering she can have been slumbering we can have been slumbering you can have been slumbering they can have been slumbering
Negation
Simple form
I cannot slumber you cannot slumber she cannot slumber we cannot slumber you cannot slumber they cannot slumber
V-ing form
I cannot be slumbering you cannot be slumbering she cannot be slumbering we cannot be slumbering you cannot be slumbering they cannot be slumbering
Perfect
I cannot have slumbered you cannot have slumbered she cannot have slumbered we cannot have slumbered you cannot have slumbered they cannot have slumbered
V-ing perfect
I cannot have been slumbering you cannot have been slumbering she cannot have been slumbering we cannot have been slumbering you cannot have been slumbering they cannot have been slumbering
Interrogative form
Simple form
can I slumber? can you slumber? can she slumber? can we slumber? can you slumber? can they slumber?
V-ing form
can I be slumbering? can you be slumbering? can she be slumbering? can we be slumbering? can you be slumbering? can they be slumbering?
Perfect
can I have slumbered? can you have slumbered? can she have slumbered? can we have slumbered? can you have slumbered? can they have slumbered?
V-ing perfect
can I have been slumbering? can you have been slumbering? can she have been slumbering? can we have been slumbering? can you have been slumbering? can they have been slumbering?
Interro-negative form
Simple form
can I not slumber? can you not slumber? can she not slumber? can we not slumber? can you not slumber? can they not slumber?
V-ing form
can I not be slumbering? can you not be slumbering? can she not be slumbering? can we not be slumbering? can you not be slumbering? can they not be slumbering?
Perfect
can I not have slumbered? can you not have slumbered? can she not have slumbered? can we not have slumbered? can you not have slumbered? can they not have slumbered?
V-ing perfect
can I not have been slumbering? can you not have been slumbering? can she not have been slumbering? can we not have been slumbering? can you not have been slumbering? can they not have been slumbering?