could silver
Verbo regular: silver - silvered- silvered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could silver
you could silver
he could silver
we could silver
you could silver
they could silver 	I could be silvering
you could be silvering
he could be silvering
we could be silvering
you could be silvering
they could be silvering	I could have silvered
you could have silvered
he could have silvered
we could have silvered
you could have silvered
they could have silvered	I could have been silvering
you could have been silvering
he could have been silvering
we could have been silvering
you could have been silvering
they could have been silvering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not silver
you could not silver
he could not silver
we could not silver
you could not silver
they could not silver 	I could not be silvering
you could not be silvering
he could not be silvering
we could not be silvering
you could not be silvering
they could not be silvering	I could not have silvered
you could not have silvered
he could not have silvered
we could not have silvered
you could not have silvered
they could not have silvered	I could not have been silvering
you could not have been silvering
he could not have been silvering
we could not have been silvering
you could not have been silvering
they could not have been silvering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I silver?
could you silver?
could he silver?
could we silver?
could you silver?
could they silver? 	could I be silvering?
could you be silvering?
could he be silvering?
could we be silvering?
could you be silvering?
could they be silvering? 	could I have silvered?
could you have silvered?
could he have silvered?
could we have silvered?
could you have silvered?
could they have silvered? 	could I have been silvering?
could you have been silvering?
could he have been silvering?
could we have been silvering?
could you have been silvering?
could they have been silvering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not silver?
could you not silver?
could he not silver?
could we not silver?
could you not silver?
could they not silver? 	could I not be silvering?
could you not be silvering?
could he not be silvering?
could we not be silvering?
could you not be silvering?
could they not be silvering? 	could I not have silvered?
could you not have silvered?
could he not have silvered?
could we not have silvered?
could you not have silvered?
could they not have silvered? 	could I not have been silvering?
could you not have been silvering?
could he not have been silvering?
could we not have been silvering?
could you not have been silvering?
could they not have been silvering?