could brighten
Verbo regolare: brighten - brightened- brightened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could brighten
you could brighten
she could brighten
we could brighten
you could brighten
they could brighten 	I could be brightening
you could be brightening
she could be brightening
we could be brightening
you could be brightening
they could be brightening	I could have brightened
you could have brightened
she could have brightened
we could have brightened
you could have brightened
they could have brightened	I could have been brightening
you could have been brightening
she could have been brightening
we could have been brightening
you could have been brightening
they could have been brightening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not brighten
you could not brighten
she could not brighten
we could not brighten
you could not brighten
they could not brighten 	I could not be brightening
you could not be brightening
she could not be brightening
we could not be brightening
you could not be brightening
they could not be brightening	I could not have brightened
you could not have brightened
she could not have brightened
we could not have brightened
you could not have brightened
they could not have brightened	I could not have been brightening
you could not have been brightening
she could not have been brightening
we could not have been brightening
you could not have been brightening
they could not have been brightening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I brighten?
could you brighten?
could she brighten?
could we brighten?
could you brighten?
could they brighten? 	could I be brightening?
could you be brightening?
could she be brightening?
could we be brightening?
could you be brightening?
could they be brightening? 	could I have brightened?
could you have brightened?
could she have brightened?
could we have brightened?
could you have brightened?
could they have brightened? 	could I have been brightening?
could you have been brightening?
could she have been brightening?
could we have been brightening?
could you have been brightening?
could they have been brightening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not brighten?
could you not brighten?
could she not brighten?
could we not brighten?
could you not brighten?
could they not brighten? 	could I not be brightening?
could you not be brightening?
could she not be brightening?
could we not be brightening?
could you not be brightening?
could they not be brightening? 	could I not have brightened?
could you not have brightened?
could she not have brightened?
could we not have brightened?
could you not have brightened?
could they not have brightened? 	could I not have been brightening?
could you not have been brightening?
could she not have been brightening?
could we not have been brightening?
could you not have been brightening?
could they not have been brightening?