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 could not bird-dog
you could not bird-dog
he could not bird-dog
we could not bird-dog
you could not bird-dog
they could not bird-dog 	I could not be bird-doging
you could not be bird-doging
he could not be bird-doging
we could not be bird-doging
you could not be bird-doging
they could not be bird-doging	I could not have bird-doged
you could not have bird-doged
he could not have bird-doged
we could not have bird-doged
you could not have bird-doged
they could not have bird-doged	I could not have been bird-doging
you could not have been bird-doging
he could not have been bird-doging
we could not have been bird-doging
you could not have been bird-doging
they could not 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 	
could I not bird-dog?
could you not bird-dog?
could he not bird-dog?
could we not bird-dog?
could you not bird-dog?
could they not bird-dog? 	could I not be bird-doging?
could you not be bird-doging?
could he not be bird-doging?
could we not be bird-doging?
could you not be bird-doging?
could they not be bird-doging? 	could I not have bird-doged?
could you not have bird-doged?
could he not have bird-doged?
could we not have bird-doged?
could you not have bird-doged?
could they not have bird-doged? 	could I not have been bird-doging?
could you not have been bird-doging?
could he not have been bird-doging?
could we not have been bird-doging?
could you not have been bird-doging?
could they not have been bird-doging?