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