could coal coal
Regular verb: coal coal - coal coaled- coal coaled

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

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could coal coal
you could coal coal
he could coal coal
we could coal coal
you could coal coal
they could coal coal 	I could be coal coaling
you could be coal coaling
he could be coal coaling
we could be coal coaling
you could be coal coaling
they could be coal coaling	I could have coal coaled
you could have coal coaled
he could have coal coaled
we could have coal coaled
you could have coal coaled
they could have coal coaled	I could have been coal coaling
you could have been coal coaling
he could have been coal coaling
we could have been coal coaling
you could have been coal coaling
they could have been coal coaling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't coal coal
you couldn't coal coal
he couldn't coal coal
we couldn't coal coal
you couldn't coal coal
they couldn't coal coal 	I couldn't be coal coaling
you couldn't be coal coaling
he couldn't be coal coaling
we couldn't be coal coaling
you couldn't be coal coaling
they couldn't be coal coaling	I couldn't have coal coaled
you couldn't have coal coaled
he couldn't have coal coaled
we couldn't have coal coaled
you couldn't have coal coaled
they couldn't have coal coaled	I couldn't have been coal coaling
you couldn't have been coal coaling
he couldn't have been coal coaling
we couldn't have been coal coaling
you couldn't have been coal coaling
they couldn't have been coal coaling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I coal coal?
could you coal coal?
could he coal coal?
could we coal coal?
could you coal coal?
could they coal coal? 	could I be coal coaling?
could you be coal coaling?
could he be coal coaling?
could we be coal coaling?
could you be coal coaling?
could they be coal coaling? 	could I have coal coaled?
could you have coal coaled?
could he have coal coaled?
could we have coal coaled?
could you have coal coaled?
could they have coal coaled? 	could I have been coal coaling?
could you have been coal coaling?
could he have been coal coaling?
could we have been coal coaling?
could you have been coal coaling?
could they have been coal coaling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I coal coal?
couldn't you coal coal?
couldn't he coal coal?
couldn't we coal coal?
couldn't you coal coal?
couldn't they coal coal? 	couldn't I be coal coaling?
couldn't you be coal coaling?
couldn't he be coal coaling?
couldn't we be coal coaling?
couldn't you be coal coaling?
couldn't they be coal coaling? 	couldn't I have coal coaled?
couldn't you have coal coaled?
couldn't he have coal coaled?
couldn't we have coal coaled?
couldn't you have coal coaled?
couldn't they have coal coaled? 	couldn't I have been coal coaling?
couldn't you have been coal coaling?
couldn't he have been coal coaling?
couldn't we have been coal coaling?
couldn't you have been coal coaling?
couldn't they have been coal coaling?