could crystallize
Verbo regular: crystallize - crystallized- crystallized

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could crystallize
you could crystallize
he could crystallize
we could crystallize
you could crystallize
they could crystallize 	I could be crystallizing
you could be crystallizing
he could be crystallizing
we could be crystallizing
you could be crystallizing
they could be crystallizing	I could have crystallized
you could have crystallized
he could have crystallized
we could have crystallized
you could have crystallized
they could have crystallized	I could have been crystallizing
you could have been crystallizing
he could have been crystallizing
we could have been crystallizing
you could have been crystallizing
they could have been crystallizing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not crystallize
you could not crystallize
he could not crystallize
we could not crystallize
you could not crystallize
they could not crystallize 	I could not be crystallizing
you could not be crystallizing
he could not be crystallizing
we could not be crystallizing
you could not be crystallizing
they could not be crystallizing	I could not have crystallized
you could not have crystallized
he could not have crystallized
we could not have crystallized
you could not have crystallized
they could not have crystallized	I could not have been crystallizing
you could not have been crystallizing
he could not have been crystallizing
we could not have been crystallizing
you could not have been crystallizing
they could not have been crystallizing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I crystallize?
could you crystallize?
could he crystallize?
could we crystallize?
could you crystallize?
could they crystallize? 	could I be crystallizing?
could you be crystallizing?
could he be crystallizing?
could we be crystallizing?
could you be crystallizing?
could they be crystallizing? 	could I have crystallized?
could you have crystallized?
could he have crystallized?
could we have crystallized?
could you have crystallized?
could they have crystallized? 	could I have been crystallizing?
could you have been crystallizing?
could he have been crystallizing?
could we have been crystallizing?
could you have been crystallizing?
could they have been crystallizing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not crystallize?
could you not crystallize?
could he not crystallize?
could we not crystallize?
could you not crystallize?
could they not crystallize? 	could I not be crystallizing?
could you not be crystallizing?
could he not be crystallizing?
could we not be crystallizing?
could you not be crystallizing?
could they not be crystallizing? 	could I not have crystallized?
could you not have crystallized?
could he not have crystallized?
could we not have crystallized?
could you not have crystallized?
could they not have crystallized? 	could I not have been crystallizing?
could you not have been crystallizing?
could he not have been crystallizing?
could we not have been crystallizing?
could you not have been crystallizing?
could they not have been crystallizing?