could arc
Regular verb: arc - arced- arced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could arc
you could arc
he could arc
we could arc
you could arc
they could arc 	I could be arcing
you could be arcing
he could be arcing
we could be arcing
you could be arcing
they could be arcing	I could have arced
you could have arced
he could have arced
we could have arced
you could have arced
they could have arced	I could have been arcing
you could have been arcing
he could have been arcing
we could have been arcing
you could have been arcing
they could have been arcing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't arc
you couldn't arc
he couldn't arc
we couldn't arc
you couldn't arc
they couldn't arc 	I couldn't be arcing
you couldn't be arcing
he couldn't be arcing
we couldn't be arcing
you couldn't be arcing
they couldn't be arcing	I couldn't have arced
you couldn't have arced
he couldn't have arced
we couldn't have arced
you couldn't have arced
they couldn't have arced	I couldn't have been arcing
you couldn't have been arcing
he couldn't have been arcing
we couldn't have been arcing
you couldn't have been arcing
they couldn't have been arcing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I arc?
could you arc?
could he arc?
could we arc?
could you arc?
could they arc? 	could I be arcing?
could you be arcing?
could he be arcing?
could we be arcing?
could you be arcing?
could they be arcing? 	could I have arced?
could you have arced?
could he have arced?
could we have arced?
could you have arced?
could they have arced? 	could I have been arcing?
could you have been arcing?
could he have been arcing?
could we have been arcing?
could you have been arcing?
could they have been arcing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I arc?
couldn't you arc?
couldn't he arc?
couldn't we arc?
couldn't you arc?
couldn't they arc? 	couldn't I be arcing?
couldn't you be arcing?
couldn't he be arcing?
couldn't we be arcing?
couldn't you be arcing?
couldn't they be arcing? 	couldn't I have arced?
couldn't you have arced?
couldn't he have arced?
couldn't we have arced?
couldn't you have arced?
couldn't they have arced? 	couldn't I have been arcing?
couldn't you have been arcing?
couldn't he have been arcing?
couldn't we have been arcing?
couldn't you have been arcing?
couldn't they have been arcing?