must retighten
Regular verb: retighten - retightened- retightened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must retighten
you must retighten
he must retighten
we must retighten
you must retighten
they must retighten 	I must be retightening
you must be retightening
he must be retightening
we must be retightening
you must be retightening
they must be retightening	I must have retightened
you must have retightened
he must have retightened
we must have retightened
you must have retightened
they must have retightened	I must have been retightening
you must have been retightening
he must have been retightening
we must have been retightening
you must have been retightening
they must have been retightening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not retighten
you must not retighten
he must not retighten
we must not retighten
you must not retighten
they must not retighten 	I must not be retightening
you must not be retightening
he must not be retightening
we must not be retightening
you must not be retightening
they must not be retightening	I must not have retightened
you must not have retightened
he must not have retightened
we must not have retightened
you must not have retightened
they must not have retightened	I must not have been retightening
you must not have been retightening
he must not have been retightening
we must not have been retightening
you must not have been retightening
they must not have been retightening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I retighten?
must you retighten?
must he retighten?
must we retighten?
must you retighten?
must they retighten? 	must I be retightening?
must you be retightening?
must he be retightening?
must we be retightening?
must you be retightening?
must they be retightening? 	must I have retightened?
must you have retightened?
must he have retightened?
must we have retightened?
must you have retightened?
must they have retightened? 	must I have been retightening?
must you have been retightening?
must he have been retightening?
must we have been retightening?
must you have been retightening?
must they have been retightening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not retighten?
must you not retighten?
must he not retighten?
must we not retighten?
must you not retighten?
must they not retighten? 	must I not be retightening?
must you not be retightening?
must he not be retightening?
must we not be retightening?
must you not be retightening?
must they not be retightening? 	must I not have retightened?
must you not have retightened?
must he not have retightened?
must we not have retightened?
must you not have retightened?
must they not have retightened? 	must I not have been retightening?
must you not have been retightening?
must he not have been retightening?
must we not have been retightening?
must you not have been retightening?
must they not have been retightening?