I'd be flashing you'd be flashing she'd be flashing we'd be flashing you'd be flashing they'd be flashing
Perfect
I should've flashed you should've flashed she should've flashed we should've flashed you should've flashed they should've flashed
V-ing perfect
I should've been flashing you should've been flashing she should've been flashing we should've been flashing you should've been flashing they should've been flashing
Negation
Simple form
I shouldn't flash you shouldn't flash she shouldn't flash we shouldn't flash you shouldn't flash they shouldn't flash
V-ing form
I shouldn't be flashing you shouldn't be flashing she shouldn't be flashing we shouldn't be flashing you shouldn't be flashing they shouldn't be flashing
Perfect
I shouldn't have flashed you shouldn't have flashed she shouldn't have flashed we shouldn't have flashed you shouldn't have flashed they shouldn't have flashed
V-ing perfect
I shouldn't have been flashing you shouldn't have been flashing she shouldn't have been flashing we shouldn't have been flashing you shouldn't have been flashing they shouldn't have been flashing
Interrogative form
Simple form
should I flash? should you flash? should she flash? should we flash? should you flash? should they flash?
V-ing form
should I be flashing? should you be flashing? should she be flashing? should we be flashing? should you be flashing? should they be flashing?
Perfect
should I have flashed? should you have flashed? should she have flashed? should we have flashed? should you have flashed? should they have flashed?
V-ing perfect
should I have been flashing? should you have been flashing? should she have been flashing? should we have been flashing? should you have been flashing? should they have been flashing?
Interro-negative form
Simple form
shouldn't I flash? shouldn't you flash? shouldn't she flash? shouldn't we flash? shouldn't you flash? shouldn't they flash?
V-ing form
shouldn't I be flashing? shouldn't you be flashing? shouldn't she be flashing? shouldn't we be flashing? shouldn't you be flashing? shouldn't they be flashing?
Perfect
shouldn't I have flashed? shouldn't you have flashed? shouldn't she have flashed? shouldn't we have flashed? shouldn't you have flashed? shouldn't they have flashed?
V-ing perfect
shouldn't I have been flashing? shouldn't you have been flashing? shouldn't she have been flashing? shouldn't we have been flashing? shouldn't you have been flashing? shouldn't they have been flashing?