could righten
Regular verb: righten - rightened- rightened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could righten
you could righten
she could righten
we could righten
you could righten
they could righten 	I could be rightening
you could be rightening
she could be rightening
we could be rightening
you could be rightening
they could be rightening	I could have rightened
you could have rightened
she could have rightened
we could have rightened
you could have rightened
they could have rightened	I could have been rightening
you could have been rightening
she could have been rightening
we could have been rightening
you could have been rightening
they could have been rightening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not righten
you could not righten
she could not righten
we could not righten
you could not righten
they could not righten 	I could not be rightening
you could not be rightening
she could not be rightening
we could not be rightening
you could not be rightening
they could not be rightening	I could not have rightened
you could not have rightened
she could not have rightened
we could not have rightened
you could not have rightened
they could not have rightened	I could not have been rightening
you could not have been rightening
she could not have been rightening
we could not have been rightening
you could not have been rightening
they could not have been rightening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I righten?
could you righten?
could she righten?
could we righten?
could you righten?
could they righten? 	could I be rightening?
could you be rightening?
could she be rightening?
could we be rightening?
could you be rightening?
could they be rightening? 	could I have rightened?
could you have rightened?
could she have rightened?
could we have rightened?
could you have rightened?
could they have rightened? 	could I have been rightening?
could you have been rightening?
could she have been rightening?
could we have been rightening?
could you have been rightening?
could they have been rightening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not righten?
could you not righten?
could she not righten?
could we not righten?
could you not righten?
could they not righten? 	could I not be rightening?
could you not be rightening?
could she not be rightening?
could we not be rightening?
could you not be rightening?
could they not be rightening? 	could I not have rightened?
could you not have rightened?
could she not have rightened?
could we not have rightened?
could you not have rightened?
could they not have rightened? 	could I not have been rightening?
could you not have been rightening?
could she not have been rightening?
could we not have been rightening?
could you not have been rightening?
could they not have been rightening?