could bird-dog
Regular verb: bird-dog - bird-doged- bird-doged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bird-dog
you could bird-dog
he could bird-dog
we could bird-dog
you could bird-dog
they could bird-dog 	I could be bird-doging
you could be bird-doging
he could be bird-doging
we could be bird-doging
you could be bird-doging
they could be bird-doging	I could have bird-doged
you could have bird-doged
he could have bird-doged
we could have bird-doged
you could have bird-doged
they could have bird-doged	I could have been bird-doging
you could have been bird-doging
he could have been bird-doging
we could have been bird-doging
you could have been bird-doging
they could have been bird-doging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bird-dog
you couldn't bird-dog
he couldn't bird-dog
we couldn't bird-dog
you couldn't bird-dog
they couldn't bird-dog 	I couldn't be bird-doging
you couldn't be bird-doging
he couldn't be bird-doging
we couldn't be bird-doging
you couldn't be bird-doging
they couldn't be bird-doging	I couldn't have bird-doged
you couldn't have bird-doged
he couldn't have bird-doged
we couldn't have bird-doged
you couldn't have bird-doged
they couldn't have bird-doged	I couldn't have been bird-doging
you couldn't have been bird-doging
he couldn't have been bird-doging
we couldn't have been bird-doging
you couldn't have been bird-doging
they couldn't have been bird-doging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I bird-dog?
could you bird-dog?
could he bird-dog?
could we bird-dog?
could you bird-dog?
could they bird-dog? 	could I be bird-doging?
could you be bird-doging?
could he be bird-doging?
could we be bird-doging?
could you be bird-doging?
could they be bird-doging? 	could I have bird-doged?
could you have bird-doged?
could he have bird-doged?
could we have bird-doged?
could you have bird-doged?
could they have bird-doged? 	could I have been bird-doging?
could you have been bird-doging?
could he have been bird-doging?
could we have been bird-doging?
could you have been bird-doging?
could they have been bird-doging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I bird-dog?
couldn't you bird-dog?
couldn't he bird-dog?
couldn't we bird-dog?
couldn't you bird-dog?
couldn't they bird-dog? 	couldn't I be bird-doging?
couldn't you be bird-doging?
couldn't he be bird-doging?
couldn't we be bird-doging?
couldn't you be bird-doging?
couldn't they be bird-doging? 	couldn't I have bird-doged?
couldn't you have bird-doged?
couldn't he have bird-doged?
couldn't we have bird-doged?
couldn't you have bird-doged?
couldn't they have bird-doged? 	couldn't I have been bird-doging?
couldn't you have been bird-doging?
couldn't he have been bird-doging?
couldn't we have been bird-doging?
couldn't you have been bird-doging?
couldn't they have been bird-doging?