English verb conjugation
SHOULD TIGHTEN

Regular verb: tighten - tightened - tightened

Affirmation

Simple form	V-ing form
I should tighten you should tighten he should tighten we should tighten you should tighten they should tighten	I should be tightening you should be tightening he should be tightening we should be tightening you should be tightening they should be tightening
Perfect	V-ing perfect
I should have tightened you should have tightened he should have tightened we should have tightened you should have tightened they should have tightened	I should have been tightening you should have been tightening he should have been tightening we should have been tightening you should have been tightening they should have been tightening

Negation

Simple form	V-ing form
I should not tighten you should not tighten he should not tighten we should not tighten you should not tighten they should not tighten	I should not be tightening you should not be tightening he should not be tightening we should not be tightening you should not be tightening they should not be tightening
Perfect	V-ing perfect
I should not have tightened you should not have tightened he should not have tightened we should not have tightened you should not have tightened they should not have tightened	I should not have been tightening you should not have been tightening he should not have been tightening we should not have been tightening you should not have been tightening they should not have been tightening

Interrogative form

Simple form	V-ing form
should I tighten? should you tighten? should he tighten? should we tighten? should you tighten? should they tighten?	should I be tightening? should you be tightening? should he be tightening? should we be tightening? should you be tightening? should they be tightening?
Perfect	V-ing perfect
should I have tightened? should you have tightened? should he have tightened? should we have tightened? should you have tightened? should they have tightened?	should I have been tightening? should you have been tightening? should he have been tightening? should we have been tightening? should you have been tightening? should they have been tightening?

Interro-negative form

Simple form	V-ing form
should I not tighten? should you not tighten? should he not tighten? should we not tighten? should you not tighten? should they not tighten?	should I not be tightening? should you not be tightening? should he not be tightening? should we not be tightening? should you not be tightening? should they not be tightening?
Perfect	V-ing perfect
should I not have tightened? should you not have tightened? should he not have tightened? should we not have tightened? should you not have tightened? should they not have tightened?	should I not have been tightening? should you not have been tightening? should he not have been tightening? should we not have been tightening? should you not have been tightening? should they not have been tightening?