I can slither you can slither he can slither we can slither you can slither they can slither
V-ing form
I can be slithering you can be slithering he can be slithering we can be slithering you can be slithering they can be slithering
Perfect
I can have slithered you can have slithered he can have slithered we can have slithered you can have slithered they can have slithered
V-ing perfect
I can have been slithering you can have been slithering he can have been slithering we can have been slithering you can have been slithering they can have been slithering
Negation
Simple form
I can't slither you can't slither he can't slither we can't slither you can't slither they can't slither
V-ing form
I can't be slithering you can't be slithering he can't be slithering we can't be slithering you can't be slithering they can't be slithering
Perfect
I can't have slithered you can't have slithered he can't have slithered we can't have slithered you can't have slithered they can't have slithered
V-ing perfect
I can't have been slithering you can't have been slithering he can't have been slithering we can't have been slithering you can't have been slithering they can't have been slithering
Interrogative form
Simple form
can I slither? can you slither? can he slither? can we slither? can you slither? can they slither?
V-ing form
can I be slithering? can you be slithering? can he be slithering? can we be slithering? can you be slithering? can they be slithering?
Perfect
can I have slithered? can you have slithered? can he have slithered? can we have slithered? can you have slithered? can they have slithered?
V-ing perfect
can I have been slithering? can you have been slithering? can he have been slithering? can we have been slithering? can you have been slithering? can they have been slithering?
Interro-negative form
Simple form
can't I slither? can't you slither? can't he slither? can't we slither? can't you slither? can't they slither?
V-ing form
can't I be slithering? can't you be slithering? can't he be slithering? can't we be slithering? can't you be slithering? can't they be slithering?
Perfect
can't I have slithered? can't you have slithered? can't he have slithered? can't we have slithered? can't you have slithered? can't they have slithered?
V-ing perfect
can't I have been slithering? can't you have been slithering? can't he have been slithering? can't we have been slithering? can't you have been slithering? can't they have been slithering?