could concretize
Verbo regular: concretize - concretized- concretized

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could concretize
you could concretize
he could concretize
we could concretize
you could concretize
they could concretize 	I could be concretizing
you could be concretizing
he could be concretizing
we could be concretizing
you could be concretizing
they could be concretizing	I could have concretized
you could have concretized
he could have concretized
we could have concretized
you could have concretized
they could have concretized	I could have been concretizing
you could have been concretizing
he could have been concretizing
we could have been concretizing
you could have been concretizing
they could have been concretizing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't concretize
you couldn't concretize
he couldn't concretize
we couldn't concretize
you couldn't concretize
they couldn't concretize 	I couldn't be concretizing
you couldn't be concretizing
he couldn't be concretizing
we couldn't be concretizing
you couldn't be concretizing
they couldn't be concretizing	I couldn't have concretized
you couldn't have concretized
he couldn't have concretized
we couldn't have concretized
you couldn't have concretized
they couldn't have concretized	I couldn't have been concretizing
you couldn't have been concretizing
he couldn't have been concretizing
we couldn't have been concretizing
you couldn't have been concretizing
they couldn't have been concretizing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I concretize?
could you concretize?
could he concretize?
could we concretize?
could you concretize?
could they concretize? 	could I be concretizing?
could you be concretizing?
could he be concretizing?
could we be concretizing?
could you be concretizing?
could they be concretizing? 	could I have concretized?
could you have concretized?
could he have concretized?
could we have concretized?
could you have concretized?
could they have concretized? 	could I have been concretizing?
could you have been concretizing?
could he have been concretizing?
could we have been concretizing?
could you have been concretizing?
could they have been concretizing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I concretize?
couldn't you concretize?
couldn't he concretize?
couldn't we concretize?
couldn't you concretize?
couldn't they concretize? 	couldn't I be concretizing?
couldn't you be concretizing?
couldn't he be concretizing?
couldn't we be concretizing?
couldn't you be concretizing?
couldn't they be concretizing? 	couldn't I have concretized?
couldn't you have concretized?
couldn't he have concretized?
couldn't we have concretized?
couldn't you have concretized?
couldn't they have concretized? 	couldn't I have been concretizing?
couldn't you have been concretizing?
couldn't he have been concretizing?
couldn't we have been concretizing?
couldn't you have been concretizing?
couldn't they have been concretizing?