could hiss
Verbo regular: hiss - hissed- hissed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could hiss
you could hiss
he could hiss
we could hiss
you could hiss
they could hiss 	I could be hissing
you could be hissing
he could be hissing
we could be hissing
you could be hissing
they could be hissing	I could have hissed
you could have hissed
he could have hissed
we could have hissed
you could have hissed
they could have hissed	I could have been hissing
you could have been hissing
he could have been hissing
we could have been hissing
you could have been hissing
they could have been hissing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not hiss
you could not hiss
he could not hiss
we could not hiss
you could not hiss
they could not hiss 	I could not be hissing
you could not be hissing
he could not be hissing
we could not be hissing
you could not be hissing
they could not be hissing	I could not have hissed
you could not have hissed
he could not have hissed
we could not have hissed
you could not have hissed
they could not have hissed	I could not have been hissing
you could not have been hissing
he could not have been hissing
we could not have been hissing
you could not have been hissing
they could not have been hissing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I hiss?
could you hiss?
could he hiss?
could we hiss?
could you hiss?
could they hiss? 	could I be hissing?
could you be hissing?
could he be hissing?
could we be hissing?
could you be hissing?
could they be hissing? 	could I have hissed?
could you have hissed?
could he have hissed?
could we have hissed?
could you have hissed?
could they have hissed? 	could I have been hissing?
could you have been hissing?
could he have been hissing?
could we have been hissing?
could you have been hissing?
could they have been hissing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not hiss?
could you not hiss?
could he not hiss?
could we not hiss?
could you not hiss?
could they not hiss? 	could I not be hissing?
could you not be hissing?
could he not be hissing?
could we not be hissing?
could you not be hissing?
could they not be hissing? 	could I not have hissed?
could you not have hissed?
could he not have hissed?
could we not have hissed?
could you not have hissed?
could they not have hissed? 	could I not have been hissing?
could you not have been hissing?
could he not have been hissing?
could we not have been hissing?
could you not have been hissing?
could they not have been hissing?