could sium
Verbo regular: sium - siumed- siumed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could sium
you could sium
she could sium
we could sium
you could sium
they could sium 	I could be siuming
you could be siuming
she could be siuming
we could be siuming
you could be siuming
they could be siuming	I could have siumed
you could have siumed
she could have siumed
we could have siumed
you could have siumed
they could have siumed	I could have been siuming
you could have been siuming
she could have been siuming
we could have been siuming
you could have been siuming
they could have been siuming	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not sium
you could not sium
she could not sium
we could not sium
you could not sium
they could not sium 	I could not be siuming
you could not be siuming
she could not be siuming
we could not be siuming
you could not be siuming
they could not be siuming	I could not have siumed
you could not have siumed
she could not have siumed
we could not have siumed
you could not have siumed
they could not have siumed	I could not have been siuming
you could not have been siuming
she could not have been siuming
we could not have been siuming
you could not have been siuming
they could not have been siuming	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I sium?
could you sium?
could she sium?
could we sium?
could you sium?
could they sium? 	could I be siuming?
could you be siuming?
could she be siuming?
could we be siuming?
could you be siuming?
could they be siuming? 	could I have siumed?
could you have siumed?
could she have siumed?
could we have siumed?
could you have siumed?
could they have siumed? 	could I have been siuming?
could you have been siuming?
could she have been siuming?
could we have been siuming?
could you have been siuming?
could they have been siuming? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not sium?
could you not sium?
could she not sium?
could we not sium?
could you not sium?
could they not sium? 	could I not be siuming?
could you not be siuming?
could she not be siuming?
could we not be siuming?
could you not be siuming?
could they not be siuming? 	could I not have siumed?
could you not have siumed?
could she not have siumed?
could we not have siumed?
could you not have siumed?
could they not have siumed? 	could I not have been siuming?
could you not have been siuming?
could she not have been siuming?
could we not have been siuming?
could you not have been siuming?
could they not have been siuming?