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
he could grey
we could grey
you could grey
they could grey 	I could be greying
you could be greying
he could be greying
we could be greying
you could be greying
they could be greying	I could have greyed
you could have greyed
he 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
he 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 couldn't grey
you couldn't grey
he couldn't grey
we couldn't grey
you couldn't grey
they couldn't grey 	I couldn't be greying
you couldn't be greying
he couldn't be greying
we couldn't be greying
you couldn't be greying
they couldn't be greying	I couldn't have greyed
you couldn't have greyed
he couldn't have greyed
we couldn't have greyed
you couldn't have greyed
they couldn't have greyed	I couldn't have been greying
you couldn't have been greying
he couldn't have been greying
we couldn't have been greying
you couldn't have been greying
they couldn't have been greying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I grey?
could you grey?
could he grey?
could we grey?
could you grey?
could they grey? 	could I be greying?
could you be greying?
could he be greying?
could we be greying?
could you be greying?
could they be greying? 	could I have greyed?
could you have greyed?
could he 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 he 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 	
couldn't I grey?
couldn't you grey?
couldn't he grey?
couldn't we grey?
couldn't you grey?
couldn't they grey? 	couldn't I be greying?
couldn't you be greying?
couldn't he be greying?
couldn't we be greying?
couldn't you be greying?
couldn't they be greying? 	couldn't I have greyed?
couldn't you have greyed?
couldn't he have greyed?
couldn't we have greyed?
couldn't you have greyed?
couldn't they have greyed? 	couldn't I have been greying?
couldn't you have been greying?
couldn't he have been greying?
couldn't we have been greying?
couldn't you have been greying?
couldn't they have been greying?