could grey
Regular verb: grey - greyed- greyed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't grey
you couldn't grey
she 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
she 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
she 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
she couldn't have been greying
we couldn't have been greying
you couldn't have been greying
they couldn't have been greying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I grey?
couldn't you grey?
couldn't she 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 she 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 she 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 she have been greying?
couldn't we have been greying?
couldn't you have been greying?
couldn't they have been greying?