English verb conjugation
SHOULD TIGHTEN

Regular verb: tighten - tightened - tightened

Affirmation

Simple form	V-ing form
I'd tighten you'd tighten she'd tighten we'd tighten you'd tighten they'd tighten	I'd be tightening you'd be tightening she'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 she 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 she 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 she 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 she 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 she 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 she 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 she tighten? should we tighten? should you tighten? should they tighten?	should I be tightening? should you be tightening? should she 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 she 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 she 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 she 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 she 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 she 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 she have been tightening? shouldn't we have been tightening? shouldn't you have been tightening? shouldn't they have been tightening?