English verb conjugation
MUST RETIGHTEN

Regular verb: retighten - retightened - retightened

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I mustn't retighten you mustn't retighten he mustn't retighten we mustn't retighten you mustn't retighten they mustn't retighten	I mustn't be retightening you mustn't be retightening he mustn't be retightening we mustn't be retightening you mustn't be retightening they mustn't be retightening
Perfect	V-ing perfect
I mustn't have retightened you mustn't have retightened he mustn't have retightened we mustn't have retightened you mustn't have retightened they mustn't have retightened	I mustn't have been retightening you mustn't have been retightening he mustn't have been retightening we mustn't have been retightening you mustn't have been retightening they mustn't have been retightening

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
mustn't I retighten? mustn't you retighten? mustn't he retighten? mustn't we retighten? mustn't you retighten? mustn't they retighten?	mustn't I be retightening? mustn't you be retightening? mustn't he be retightening? mustn't we be retightening? mustn't you be retightening? mustn't they be retightening?
Perfect	V-ing perfect
mustn't I have retightened? mustn't you have retightened? mustn't he have retightened? mustn't we have retightened? mustn't you have retightened? mustn't they have retightened?	mustn't I have been retightening? mustn't you have been retightening? mustn't he have been retightening? mustn't we have been retightening? mustn't you have been retightening? mustn't they have been retightening?