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