could cab cab
Regular verb: cab cab - cab cabed- cab cabed

, this verb may not exist. Conjugation is given as example.

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cab cab
you could cab cab
he could cab cab
we could cab cab
you could cab cab
they could cab cab 	I could be cab cabing
you could be cab cabing
he could be cab cabing
we could be cab cabing
you could be cab cabing
they could be cab cabing	I could have cab cabed
you could have cab cabed
he could have cab cabed
we could have cab cabed
you could have cab cabed
they could have cab cabed	I could have been cab cabing
you could have been cab cabing
he could have been cab cabing
we could have been cab cabing
you could have been cab cabing
they could have been cab cabing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't cab cab
you couldn't cab cab
he couldn't cab cab
we couldn't cab cab
you couldn't cab cab
they couldn't cab cab 	I couldn't be cab cabing
you couldn't be cab cabing
he couldn't be cab cabing
we couldn't be cab cabing
you couldn't be cab cabing
they couldn't be cab cabing	I couldn't have cab cabed
you couldn't have cab cabed
he couldn't have cab cabed
we couldn't have cab cabed
you couldn't have cab cabed
they couldn't have cab cabed	I couldn't have been cab cabing
you couldn't have been cab cabing
he couldn't have been cab cabing
we couldn't have been cab cabing
you couldn't have been cab cabing
they couldn't have been cab cabing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cab cab?
could you cab cab?
could he cab cab?
could we cab cab?
could you cab cab?
could they cab cab? 	could I be cab cabing?
could you be cab cabing?
could he be cab cabing?
could we be cab cabing?
could you be cab cabing?
could they be cab cabing? 	could I have cab cabed?
could you have cab cabed?
could he have cab cabed?
could we have cab cabed?
could you have cab cabed?
could they have cab cabed? 	could I have been cab cabing?
could you have been cab cabing?
could he have been cab cabing?
could we have been cab cabing?
could you have been cab cabing?
could they have been cab cabing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I cab cab?
couldn't you cab cab?
couldn't he cab cab?
couldn't we cab cab?
couldn't you cab cab?
couldn't they cab cab? 	couldn't I be cab cabing?
couldn't you be cab cabing?
couldn't he be cab cabing?
couldn't we be cab cabing?
couldn't you be cab cabing?
couldn't they be cab cabing? 	couldn't I have cab cabed?
couldn't you have cab cabed?
couldn't he have cab cabed?
couldn't we have cab cabed?
couldn't you have cab cabed?
couldn't they have cab cabed? 	couldn't I have been cab cabing?
couldn't you have been cab cabing?
couldn't he have been cab cabing?
couldn't we have been cab cabing?
couldn't you have been cab cabing?
couldn't they have been cab cabing?