could cog
Regular verb: cog - coged- coged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cog
you could cog
she could cog
we could cog
you could cog
they could cog 	I could be coging
you could be coging
she could be coging
we could be coging
you could be coging
they could be coging	I could have coged
you could have coged
she could have coged
we could have coged
you could have coged
they could have coged	I could have been coging
you could have been coging
she could have been coging
we could have been coging
you could have been coging
they could have been coging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't cog
you couldn't cog
she couldn't cog
we couldn't cog
you couldn't cog
they couldn't cog 	I couldn't be coging
you couldn't be coging
she couldn't be coging
we couldn't be coging
you couldn't be coging
they couldn't be coging	I couldn't have coged
you couldn't have coged
she couldn't have coged
we couldn't have coged
you couldn't have coged
they couldn't have coged	I couldn't have been coging
you couldn't have been coging
she couldn't have been coging
we couldn't have been coging
you couldn't have been coging
they couldn't have been coging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cog?
could you cog?
could she cog?
could we cog?
could you cog?
could they cog? 	could I be coging?
could you be coging?
could she be coging?
could we be coging?
could you be coging?
could they be coging? 	could I have coged?
could you have coged?
could she have coged?
could we have coged?
could you have coged?
could they have coged? 	could I have been coging?
could you have been coging?
could she have been coging?
could we have been coging?
could you have been coging?
could they have been coging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I cog?
couldn't you cog?
couldn't she cog?
couldn't we cog?
couldn't you cog?
couldn't they cog? 	couldn't I be coging?
couldn't you be coging?
couldn't she be coging?
couldn't we be coging?
couldn't you be coging?
couldn't they be coging? 	couldn't I have coged?
couldn't you have coged?
couldn't she have coged?
couldn't we have coged?
couldn't you have coged?
couldn't they have coged? 	couldn't I have been coging?
couldn't you have been coging?
couldn't she have been coging?
couldn't we have been coging?
couldn't you have been coging?
couldn't they have been coging?