I can slumber you can slumber he can slumber we can slumber you can slumber they can slumber
V-ing form
I can be slumbering you can be slumbering he can be slumbering we can be slumbering you can be slumbering they can be slumbering
Perfect
I can have slumbered you can have slumbered he 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 he can have been slumbering we can have been slumbering you can have been slumbering they can have been slumbering
Negation
Simple form
I can't slumber you can't slumber he can't slumber we can't slumber you can't slumber they can't slumber
V-ing form
I can't be slumbering you can't be slumbering he can't be slumbering we can't be slumbering you can't be slumbering they can't be slumbering
Perfect
I can't have slumbered you can't have slumbered he can't have slumbered we can't have slumbered you can't have slumbered they can't have slumbered
V-ing perfect
I can't have been slumbering you can't have been slumbering he can't have been slumbering we can't have been slumbering you can't have been slumbering they can't have been slumbering
Interrogative form
Simple form
can I slumber? can you slumber? can he slumber? can we slumber? can you slumber? can they slumber?
V-ing form
can I be slumbering? can you be slumbering? can he be slumbering? can we be slumbering? can you be slumbering? can they be slumbering?
Perfect
can I have slumbered? can you have slumbered? can he 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 he have been slumbering? can we have been slumbering? can you have been slumbering? can they have been slumbering?
Interro-negative form
Simple form
can't I slumber? can't you slumber? can't he slumber? can't we slumber? can't you slumber? can't they slumber?
V-ing form
can't I be slumbering? can't you be slumbering? can't he be slumbering? can't we be slumbering? can't you be slumbering? can't they be slumbering?
Perfect
can't I have slumbered? can't you have slumbered? can't he have slumbered? can't we have slumbered? can't you have slumbered? can't they have slumbered?
V-ing perfect
can't I have been slumbering? can't you have been slumbering? can't he have been slumbering? can't we have been slumbering? can't you have been slumbering? can't they have been slumbering?