English verb conjugation
COULD SLITHER

Regular verb: slither - slithered - slithered

Affirmation

Simple form	V-ing form
I could slither you could slither she could slither we could slither you could slither they could slither	I could be slithering you could be slithering she could be slithering we could be slithering you could be slithering they could be slithering
Perfect	V-ing perfect
I could have slithered you could have slithered she could have slithered we could have slithered you could have slithered they could have slithered	I could have been slithering you could have been slithering she could have been slithering we could have been slithering you could have been slithering they could have been slithering

Negation

Simple form	V-ing form
I couldn't slither you couldn't slither she couldn't slither we couldn't slither you couldn't slither they couldn't slither	I couldn't be slithering you couldn't be slithering she couldn't be slithering we couldn't be slithering you couldn't be slithering they couldn't be slithering
Perfect	V-ing perfect
I couldn't have slithered you couldn't have slithered she couldn't have slithered we couldn't have slithered you couldn't have slithered they couldn't have slithered	I couldn't have been slithering you couldn't have been slithering she couldn't have been slithering we couldn't have been slithering you couldn't have been slithering they couldn't have been slithering

Interrogative form

Simple form	V-ing form
could I slither? could you slither? could she slither? could we slither? could you slither? could they slither?	could I be slithering? could you be slithering? could she be slithering? could we be slithering? could you be slithering? could they be slithering?
Perfect	V-ing perfect
could I have slithered? could you have slithered? could she have slithered? could we have slithered? could you have slithered? could they have slithered?	could I have been slithering? could you have been slithering? could she have been slithering? could we have been slithering? could you have been slithering? could they have been slithering?

Interro-negative form

Simple form	V-ing form
couldn't I slither? couldn't you slither? couldn't she slither? couldn't we slither? couldn't you slither? couldn't they slither?	couldn't I be slithering? couldn't you be slithering? couldn't she be slithering? couldn't we be slithering? couldn't you be slithering? couldn't they be slithering?
Perfect	V-ing perfect
couldn't I have slithered? couldn't you have slithered? couldn't she have slithered? couldn't we have slithered? couldn't you have slithered? couldn't they have slithered?	couldn't I have been slithering? couldn't you have been slithering? couldn't she have been slithering? couldn't we have been slithering? couldn't you have been slithering? couldn't they have been slithering?