could orbit
Regular verb: orbit - orbited- orbited

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could orbit
you could orbit
he could orbit
we could orbit
you could orbit
they could orbit 	I could be orbiting
you could be orbiting
he could be orbiting
we could be orbiting
you could be orbiting
they could be orbiting	I could have orbited
you could have orbited
he could have orbited
we could have orbited
you could have orbited
they could have orbited	I could have been orbiting
you could have been orbiting
he could have been orbiting
we could have been orbiting
you could have been orbiting
they could have been orbiting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not orbit
you could not orbit
he could not orbit
we could not orbit
you could not orbit
they could not orbit 	I could not be orbiting
you could not be orbiting
he could not be orbiting
we could not be orbiting
you could not be orbiting
they could not be orbiting	I could not have orbited
you could not have orbited
he could not have orbited
we could not have orbited
you could not have orbited
they could not have orbited	I could not have been orbiting
you could not have been orbiting
he could not have been orbiting
we could not have been orbiting
you could not have been orbiting
they could not have been orbiting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I orbit?
could you orbit?
could he orbit?
could we orbit?
could you orbit?
could they orbit? 	could I be orbiting?
could you be orbiting?
could he be orbiting?
could we be orbiting?
could you be orbiting?
could they be orbiting? 	could I have orbited?
could you have orbited?
could he have orbited?
could we have orbited?
could you have orbited?
could they have orbited? 	could I have been orbiting?
could you have been orbiting?
could he have been orbiting?
could we have been orbiting?
could you have been orbiting?
could they have been orbiting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not orbit?
could you not orbit?
could he not orbit?
could we not orbit?
could you not orbit?
could they not orbit? 	could I not be orbiting?
could you not be orbiting?
could he not be orbiting?
could we not be orbiting?
could you not be orbiting?
could they not be orbiting? 	could I not have orbited?
could you not have orbited?
could he not have orbited?
could we not have orbited?
could you not have orbited?
could they not have orbited? 	could I not have been orbiting?
could you not have been orbiting?
could he not have been orbiting?
could we not have been orbiting?
could you not have been orbiting?
could they not have been orbiting?