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 couldn't sliver you couldn't sliver he couldn't sliver we couldn't sliver you couldn't sliver they couldn't sliver	I couldn't be slivering you couldn't be slivering he couldn't be slivering we couldn't be slivering you couldn't be slivering they couldn't be slivering
Perfect	V-ing perfect
I couldn't have slivered you couldn't have slivered he couldn't have slivered we couldn't have slivered you couldn't have slivered they couldn't have slivered	I couldn't have been slivering you couldn't have been slivering he couldn't have been slivering we couldn't have been slivering you couldn't have been slivering they couldn't 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
couldn't I sliver? couldn't you sliver? couldn't he sliver? couldn't we sliver? couldn't you sliver? couldn't they sliver?	couldn't I be slivering? couldn't you be slivering? couldn't he be slivering? couldn't we be slivering? couldn't you be slivering? couldn't they be slivering?
Perfect	V-ing perfect
couldn't I have slivered? couldn't you have slivered? couldn't he have slivered? couldn't we have slivered? couldn't you have slivered? couldn't they have slivered?	couldn't I have been slivering? couldn't you have been slivering? couldn't he have been slivering? couldn't we have been slivering? couldn't you have been slivering? couldn't they have been slivering?