I'd be flapping you'd be flapping he'd be flapping we'd be flapping you'd be flapping they'd be flapping
Perfect
I should've flapped you should've flapped he should've flapped we should've flapped you should've flapped they should've flapped
V-ing perfect
I should've been flapping you should've been flapping he should've been flapping we should've been flapping you should've been flapping they should've been flapping
Negation
Simple form
I shouldn't flap you shouldn't flap he shouldn't flap we shouldn't flap you shouldn't flap they shouldn't flap
V-ing form
I shouldn't be flapping you shouldn't be flapping he shouldn't be flapping we shouldn't be flapping you shouldn't be flapping they shouldn't be flapping
Perfect
I shouldn't have flapped you shouldn't have flapped he shouldn't have flapped we shouldn't have flapped you shouldn't have flapped they shouldn't have flapped
V-ing perfect
I shouldn't have been flapping you shouldn't have been flapping he shouldn't have been flapping we shouldn't have been flapping you shouldn't have been flapping they shouldn't have been flapping
Interrogative form
Simple form
should I flap? should you flap? should he flap? should we flap? should you flap? should they flap?
V-ing form
should I be flapping? should you be flapping? should he be flapping? should we be flapping? should you be flapping? should they be flapping?
Perfect
should I have flapped? should you have flapped? should he have flapped? should we have flapped? should you have flapped? should they have flapped?
V-ing perfect
should I have been flapping? should you have been flapping? should he have been flapping? should we have been flapping? should you have been flapping? should they have been flapping?
Interro-negative form
Simple form
shouldn't I flap? shouldn't you flap? shouldn't he flap? shouldn't we flap? shouldn't you flap? shouldn't they flap?
V-ing form
shouldn't I be flapping? shouldn't you be flapping? shouldn't he be flapping? shouldn't we be flapping? shouldn't you be flapping? shouldn't they be flapping?
Perfect
shouldn't I have flapped? shouldn't you have flapped? shouldn't he have flapped? shouldn't we have flapped? shouldn't you have flapped? shouldn't they have flapped?
V-ing perfect
shouldn't I have been flapping? shouldn't you have been flapping? shouldn't he have been flapping? shouldn't we have been flapping? shouldn't you have been flapping? shouldn't they have been flapping?