could sliver
Regular verb: sliver - slivered- slivered

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