could sliver
Verbo regular: sliver - slivered- slivered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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?