could grey
Verbo regular: grey - greyed- greyed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could grey
you could grey
she could grey
we could grey
you could grey
they could grey 	I could be greying
you could be greying
she could be greying
we could be greying
you could be greying
they could be greying	I could have greyed
you could have greyed
she could have greyed
we could have greyed
you could have greyed
they could have greyed	I could have been greying
you could have been greying
she could have been greying
we could have been greying
you could have been greying
they could have been greying	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not grey
you could not grey
she could not grey
we could not grey
you could not grey
they could not grey 	I could not be greying
you could not be greying
she could not be greying
we could not be greying
you could not be greying
they could not be greying	I could not have greyed
you could not have greyed
she could not have greyed
we could not have greyed
you could not have greyed
they could not have greyed	I could not have been greying
you could not have been greying
she could not have been greying
we could not have been greying
you could not have been greying
they could not have been greying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I grey?
could you grey?
could she grey?
could we grey?
could you grey?
could they grey? 	could I be greying?
could you be greying?
could she be greying?
could we be greying?
could you be greying?
could they be greying? 	could I have greyed?
could you have greyed?
could she have greyed?
could we have greyed?
could you have greyed?
could they have greyed? 	could I have been greying?
could you have been greying?
could she have been greying?
could we have been greying?
could you have been greying?
could they have been greying? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not grey?
could you not grey?
could she not grey?
could we not grey?
could you not grey?
could they not grey? 	could I not be greying?
could you not be greying?
could she not be greying?
could we not be greying?
could you not be greying?
could they not be greying? 	could I not have greyed?
could you not have greyed?
could she not have greyed?
could we not have greyed?
could you not have greyed?
could they not have greyed? 	could I not have been greying?
could you not have been greying?
could she not have been greying?
could we not have been greying?
could you not have been greying?
could they not have been greying?