Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I may re-tighten you may re-tighten she may re-tighten we may re-tighten you may re-tighten they may re-tighten
V-ing form
I may be re-tightening you may be re-tightening she may be re-tightening we may be re-tightening you may be re-tightening they may be re-tightening
Perfect
I may have re-tightened you may have re-tightened she may have re-tightened we may have re-tightened you may have re-tightened they may have re-tightened
V-ing perfect
I may have been re-tightening you may have been re-tightening she may have been re-tightening we may have been re-tightening you may have been re-tightening they may have been re-tightening
Negation
Simple form
I may not re-tighten you may not re-tighten she may not re-tighten we may not re-tighten you may not re-tighten they may not re-tighten
V-ing form
I may not be re-tightening you may not be re-tightening she may not be re-tightening we may not be re-tightening you may not be re-tightening they may not be re-tightening
Perfect
I may not have re-tightened you may not have re-tightened she may not have re-tightened we may not have re-tightened you may not have re-tightened they may not have re-tightened
V-ing perfect
I may not have been re-tightening you may not have been re-tightening she may not have been re-tightening we may not have been re-tightening you may not have been re-tightening they may not have been re-tightening
Interrogative form
Simple form
may I re-tighten? may you re-tighten? may she re-tighten? may we re-tighten? may you re-tighten? may they re-tighten?
V-ing form
may I be re-tightening? may you be re-tightening? may she be re-tightening? may we be re-tightening? may you be re-tightening? may they be re-tightening?
Perfect
may I have re-tightened? may you have re-tightened? may she have re-tightened? may we have re-tightened? may you have re-tightened? may they have re-tightened?
V-ing perfect
may I have been re-tightening? may you have been re-tightening? may she have been re-tightening? may we have been re-tightening? may you have been re-tightening? may they have been re-tightening?
Interro-negative form
Simple form
may I not re-tighten? may you not re-tighten? may she not re-tighten? may we not re-tighten? may you not re-tighten? may they not re-tighten?
V-ing form
may I not be re-tightening? may you not be re-tightening? may she not be re-tightening? may we not be re-tightening? may you not be re-tightening? may they not be re-tightening?
Perfect
may I not have re-tightened? may you not have re-tightened? may she not have re-tightened? may we not have re-tightened? may you not have re-tightened? may they not have re-tightened?
V-ing perfect
may I not have been re-tightening? may you not have been re-tightening? may she not have been re-tightening? may we not have been re-tightening? may you not have been re-tightening? may they not have been re-tightening?