could sliver
Verbo regular: sliver - slivered- slivered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?