could billet
Regular verb: billet - billeted- billeted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could billet
you could billet
he could billet
we could billet
you could billet
they could billet 	I could be billeting
you could be billeting
he could be billeting
we could be billeting
you could be billeting
they could be billeting	I could have billeted
you could have billeted
he could have billeted
we could have billeted
you could have billeted
they could have billeted	I could have been billeting
you could have been billeting
he could have been billeting
we could have been billeting
you could have been billeting
they could have been billeting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not billet
you could not billet
he could not billet
we could not billet
you could not billet
they could not billet 	I could not be billeting
you could not be billeting
he could not be billeting
we could not be billeting
you could not be billeting
they could not be billeting	I could not have billeted
you could not have billeted
he could not have billeted
we could not have billeted
you could not have billeted
they could not have billeted	I could not have been billeting
you could not have been billeting
he could not have been billeting
we could not have been billeting
you could not have been billeting
they could not have been billeting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I billet?
could you billet?
could he billet?
could we billet?
could you billet?
could they billet? 	could I be billeting?
could you be billeting?
could he be billeting?
could we be billeting?
could you be billeting?
could they be billeting? 	could I have billeted?
could you have billeted?
could he have billeted?
could we have billeted?
could you have billeted?
could they have billeted? 	could I have been billeting?
could you have been billeting?
could he have been billeting?
could we have been billeting?
could you have been billeting?
could they have been billeting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not billet?
could you not billet?
could he not billet?
could we not billet?
could you not billet?
could they not billet? 	could I not be billeting?
could you not be billeting?
could he not be billeting?
could we not be billeting?
could you not be billeting?
could they not be billeting? 	could I not have billeted?
could you not have billeted?
could he not have billeted?
could we not have billeted?
could you not have billeted?
could they not have billeted? 	could I not have been billeting?
could you not have been billeting?
could he not have been billeting?
could we not have been billeting?
could you not have been billeting?
could they not have been billeting?