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
I should've tightened you should've tightened he should've tightened we should've tightened you should've tightened they should've tightened
V-ing perfect
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
I shouldn't tighten you shouldn't tighten he shouldn't tighten we shouldn't tighten you shouldn't tighten they shouldn't tighten
V-ing form
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
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
V-ing perfect
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
should I tighten? should you tighten? should he tighten? should we tighten? should you tighten? should they tighten?
V-ing form
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
should I have tightened? should you have tightened? should he have tightened? should we have tightened? should you have tightened? should they have tightened?
V-ing perfect
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
shouldn't I tighten? shouldn't you tighten? shouldn't he tighten? shouldn't we tighten? shouldn't you tighten? shouldn't they tighten?
V-ing form
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
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?
V-ing perfect
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?