English verb conjugation
SHOULD TIGHTEN

Regular verb: tighten - tightened - tightened

Affirmation

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

Negation

Simple form	V-ing form
I shouldn't tighten you shouldn't tighten he shouldn't tighten we shouldn't tighten you shouldn't tighten they shouldn't tighten	I shouldn't be tightening you shouldn't be tightening he shouldn't be tightening we shouldn't be tightening you shouldn't be tightening they shouldn't be tightening
Perfect	V-ing perfect
I shouldn't have tightened you shouldn't have tightened he shouldn't have tightened we shouldn't have tightened you shouldn't have tightened they shouldn't have tightened	I shouldn't have been tightening you shouldn't have been tightening he shouldn't have been tightening we shouldn't have been tightening you shouldn't have been tightening they shouldn't 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
shouldn't I tighten? shouldn't you tighten? shouldn't he tighten? shouldn't we tighten? shouldn't you tighten? shouldn't they tighten?	shouldn't I be tightening? shouldn't you be tightening? shouldn't he be tightening? shouldn't we be tightening? shouldn't you be tightening? shouldn't they be tightening?
Perfect	V-ing perfect
shouldn't I have tightened? shouldn't you have tightened? shouldn't he have tightened? shouldn't we have tightened? shouldn't you have tightened? shouldn't they have tightened?	shouldn't I have been tightening? shouldn't you have been tightening? shouldn't he have been tightening? shouldn't we have been tightening? shouldn't you have been tightening? shouldn't they have been tightening?