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 couldn't sliver
you couldn't sliver
she 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
she couldn't be slivering
we couldn't be slivering
you couldn't be slivering
they couldn't be slivering	I couldn't have slivered
you couldn't have slivered
she 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
she 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 	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 	
couldn't I sliver?
couldn't you sliver?
couldn't she 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 she be slivering?
couldn't we be slivering?
couldn't you be slivering?
couldn't they be slivering? 	couldn't I have slivered?
couldn't you have slivered?
couldn't she 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 she have been slivering?
couldn't we have been slivering?
couldn't you have been slivering?
couldn't they have been slivering?