I'd be flashing you'd be flashing he'd be flashing we'd be flashing you'd be flashing they'd be flashing
Perfect
I should've flashed you should've flashed he 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 he 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 he 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 he 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 he 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 he 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 he flash? should we flash? should you flash? should they flash?
V-ing form
should I be flashing? should you be flashing? should he be flashing? should we be flashing? should you be flashing? should they be flashing?
Perfect
should I have flashed? should you have flashed? should he 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 he 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 he 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 he 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 he 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 he have been flashing? shouldn't we have been flashing? shouldn't you have been flashing? shouldn't they have been flashing?