must righten
Regular verb: righten - rightened- rightened

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

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

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

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