English verb conjugation
COULD SLIVER

Regular verb: sliver - slivered - slivered

Affirmation

Simple form	V-ing form
I could sliver you could sliver he could sliver we could sliver you could sliver they could sliver	I could be slivering you could be slivering he could be slivering we could be slivering you could be slivering they could be slivering
Perfect	V-ing perfect
I could have slivered you could have slivered he could have slivered we could have slivered you could have slivered they could have slivered	I could have been slivering you could have been slivering he could have been slivering we could have been slivering you could have been slivering they could have been slivering

Negation

Simple form	V-ing form
I could not sliver you could not sliver he could not sliver we could not sliver you could not sliver they could not sliver	I could not be slivering you could not be slivering he could not be slivering we could not be slivering you could not be slivering they could not be slivering
Perfect	V-ing perfect
I could not have slivered you could not have slivered he could not have slivered we could not have slivered you could not have slivered they could not have slivered	I could not have been slivering you could not have been slivering he could not have been slivering we could not have been slivering you could not have been slivering they could not have been slivering

Interrogative form

Simple form	V-ing form
could I sliver? could you sliver? could he sliver? could we sliver? could you sliver? could they sliver?	could I be slivering? could you be slivering? could he be slivering? could we be slivering? could you be slivering? could they be slivering?
Perfect	V-ing perfect
could I have slivered? could you have slivered? could he have slivered? could we have slivered? could you have slivered? could they have slivered?	could I have been slivering? could you have been slivering? could he have been slivering? could we have been slivering? could you have been slivering? could they have been slivering?

Interro-negative form

Simple form	V-ing form
could I not sliver? could you not sliver? could he not sliver? could we not sliver? could you not sliver? could they not sliver?	could I not be slivering? could you not be slivering? could he not be slivering? could we not be slivering? could you not be slivering? could they not be slivering?
Perfect	V-ing perfect
could I not have slivered? could you not have slivered? could he not have slivered? could we not have slivered? could you not have slivered? could they not have slivered?	could I not have been slivering? could you not have been slivering? could he not have been slivering? could we not have been slivering? could you not have been slivering? could they not have been slivering?