could kitten
Verbo regular: kitten - kittened- kittened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could kitten
you could kitten
he could kitten
we could kitten
you could kitten
they could kitten 	I could be kittening
you could be kittening
he could be kittening
we could be kittening
you could be kittening
they could be kittening	I could have kittened
you could have kittened
he could have kittened
we could have kittened
you could have kittened
they could have kittened	I could have been kittening
you could have been kittening
he could have been kittening
we could have been kittening
you could have been kittening
they could have been kittening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not kitten
you could not kitten
he could not kitten
we could not kitten
you could not kitten
they could not kitten 	I could not be kittening
you could not be kittening
he could not be kittening
we could not be kittening
you could not be kittening
they could not be kittening	I could not have kittened
you could not have kittened
he could not have kittened
we could not have kittened
you could not have kittened
they could not have kittened	I could not have been kittening
you could not have been kittening
he could not have been kittening
we could not have been kittening
you could not have been kittening
they could not have been kittening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I kitten?
could you kitten?
could he kitten?
could we kitten?
could you kitten?
could they kitten? 	could I be kittening?
could you be kittening?
could he be kittening?
could we be kittening?
could you be kittening?
could they be kittening? 	could I have kittened?
could you have kittened?
could he have kittened?
could we have kittened?
could you have kittened?
could they have kittened? 	could I have been kittening?
could you have been kittening?
could he have been kittening?
could we have been kittening?
could you have been kittening?
could they have been kittening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not kitten?
could you not kitten?
could he not kitten?
could we not kitten?
could you not kitten?
could they not kitten? 	could I not be kittening?
could you not be kittening?
could he not be kittening?
could we not be kittening?
could you not be kittening?
could they not be kittening? 	could I not have kittened?
could you not have kittened?
could he not have kittened?
could we not have kittened?
could you not have kittened?
could they not have kittened? 	could I not have been kittening?
could you not have been kittening?
could he not have been kittening?
could we not have been kittening?
could you not have been kittening?
could they not have been kittening?