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 could not arc
you could not arc
he could not arc
we could not arc
you could not arc
they could not arc 	I could not be arcing
you could not be arcing
he could not be arcing
we could not be arcing
you could not be arcing
they could not be arcing	I could not have arced
you could not have arced
he could not have arced
we could not have arced
you could not have arced
they could not have arced	I could not have been arcing
you could not have been arcing
he could not have been arcing
we could not have been arcing
you could not have been arcing
they could not 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 	
could I not arc?
could you not arc?
could he not arc?
could we not arc?
could you not arc?
could they not arc? 	could I not be arcing?
could you not be arcing?
could he not be arcing?
could we not be arcing?
could you not be arcing?
could they not be arcing? 	could I not have arced?
could you not have arced?
could he not have arced?
could we not have arced?
could you not have arced?
could they not have arced? 	could I not have been arcing?
could you not have been arcing?
could he not have been arcing?
could we not have been arcing?
could you not have been arcing?
could they not have been arcing?