could coal
Regular verb: coal - coaled- coaled

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not coal
you could not coal
she could not coal
we could not coal
you could not coal
they could not coal 	I could not be coaling
you could not be coaling
she could not be coaling
we could not be coaling
you could not be coaling
they could not be coaling	I could not have coaled
you could not have coaled
she could not have coaled
we could not have coaled
you could not have coaled
they could not have coaled	I could not have been coaling
you could not have been coaling
she could not have been coaling
we could not have been coaling
you could not have been coaling
they could not have been coaling	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not coal?
could you not coal?
could she not coal?
could we not coal?
could you not coal?
could they not coal? 	could I not be coaling?
could you not be coaling?
could she not be coaling?
could we not be coaling?
could you not be coaling?
could they not be coaling? 	could I not have coaled?
could you not have coaled?
could she not have coaled?
could we not have coaled?
could you not have coaled?
could they not have coaled? 	could I not have been coaling?
could you not have been coaling?
could she not have been coaling?
could we not have been coaling?
could you not have been coaling?
could they not have been coaling?